Add a stub for a Downloads landing page

content/getting-GNU-Radio/_index.md

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+---
+type: getting-GNU-Radio
+title: "Getting GNU Radio"
+description: "GNU Radio is easily installable on Windows, Linux, Mac OS X and other operating systems"
+layout: os-selector
+aliases: ["Getting GNU Radio", "download"]
+operating-systems:
+ - linux
+ - osx
+ - win
+ - other
+---
+
+GNU Radio has preferred installation methods for most operating systems. Pick yours!
+

content/getting-GNU-Radio/linux/_index.md

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+---
+title: Linux
+operating-system: linux
+fa_icon: fab fa-linux
+download-link: http://example.com
+---
+
+Linux is traditionally the best-supported operating system for GNU Radio. The preferred installation method hence is typically installation through your Linux distribution's own package manager.
+
+Make sure your Linux distribution is up to date – outdated distributions ship outdated versions of GNU Radio. The **minimum supported version** of GNU Radio is 3.8. 3.7 and before are End-of-Life.

content/getting-GNU-Radio/osx/_index.md

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+---
+title: Mac OS X
+longtitle: Mac OS X on x86_64-based Macs
+operating-system: osx
+fa_icon: fab fa-apple
+downloadlinks:
+- MacPorts: https://wiki.gnuradio.org/index.php/MacInstall#Via_MacPorts_.28recommended.29
+- "radioconda for x86-based Macs (graphical installation)": https://glare.now.sh/ryanvolz/radioconda/radioconda-.*-MacOSX-x86_64.pkg
+- "radioconda for x86-based Macs (command line)": https://glare.now.sh/ryanvolz/radioconda/radioconda-.*-MacOSX-x86_64.sh
+---
+
+The recommended method for OS X is …

content/getting-GNU-Radio/others/_index.md

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+---
+title: Other
+longtitle: Other platforms
+operating-system: other
+fa_icon: far fa-question-circle
+---

content/getting-GNU-Radio/win/_index.md

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+---
+title: Microsoft Windows
+longtitle: Microsoft Windows 8.1, 10 or 11
+operating-system: win
+fa_icon: fab fa-windows
+downloadlinks:
+- "radioconda (graphical installation)": https://glare.now.sh/ryanvolz/radioconda/radioconda-.*-Windows-x86_64.exe
+---
+
+After having installed radioconda, you'll find a "radioconda" start menu entry. There, you'll find
+
+- GNU Radio Companion, the graphical interface to GNU Radio flow graph design
+  (you'll want to start here!), and
+- Conda Prompt, a shell where all relevant settings are done, should you need or
+  decide to install additional software, or build GNU Radio Out-of-Tree (OOT)
+  Modules.

layouts/getting-GNU-Radio/os-selector.html

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+{{ define "header" }}
+<div class="page-header">
+    <div class="about_header_img"></div>
+    <h1 class="offset-lg-2 col-lg-8 display-5">{{ .Title }}</h1>
+</div>
+{{ end }}
+{{ define "main" }}
+<main role="main">
+    <div class="container-fluid  bg_gray">
+        <div class="row px-2">
+            <div class="offset-lg-2">
+                {{ .Content }}
+            </div>
+            <div class="offset-lg-2 col-lg-8 offset-md-1 col-md-10">
+                <div class="row">
+                    {{ range $index, $os := (index .Params "operating-systems") }}
+                    {{ range (where $.Pages.ByWeight "Params.operating-system" $os) }}
+                    <div class="col">
+                        <div class="card">
+                            <a class="card-img-top" data-toggle="collapse" data-parent="#os-choices" href="#collapse{{ $index }}">
+                                {{ with .Params.fa_icon }}
+                                <p style="padding: 1em;"><i class="fab {{ . }} fa-10x fa-fw"></i></p>
+                                {{ end }}
+                                {{ with .Params.logo }}
+                                <img  src="{{$os}}/{{ . }}" alt="Logo of {{.Params.title}}" />
+                                {{ end }}
+                            </a>
+                            <div class="card-body">
+                                <h5 class="card-title">
+                                    <a data-toggle="collapse" data-parent="#os-choices" href="#collapse{{ $index }}">
+                                        <emph>{{ .Params.title }}</emph>
+                                    </a>
+                                </h5>
+                                <p class="card-text">
+                                    {{ with .Params.longtitle }}
+                                    {{ . }}
+                                    {{ else }}
+                                    &nbsp;
+                                    {{ end }}
+                                </p>
+                            </div>
+                        </div>
+                    </div>
+                    {{ end }}
+                    {{ end }}
+                </div>
+                <div id="os-choices" class="mb-2">
+                    {{ range $index, $os := (index .Params "operating-systems") }}
+                    {{ range (where $.Pages.ByWeight "Params.operating-system" $os) }}
+                    <div class="card">
+                        <div class="card-header">
+                            <h3 class="mb-0">
+                                <a data-toggle="collapse" data-parent="#os-choices" href="#collapse{{ $index }}"> {{ .Title }}</a>
+                            </h3>
+                        </div>
+                        <div id="collapse{{ $index }}" class="card-body collapse">
+                            <ul class="list-group list-group-flush">
+                                {{ with .Params.downloadlinks }}
+                                {{ $downloadlist := . }}
+                                <li class="list-group-item">
+                                    <ul class="list-group">
+                                        {{ range $index, $dlmap := (index $downloadlist) }}
+                                        {{ range $key, $val := . }}
+                                        <a target="_blank" href="{{ $val }}">
+                                            <li class="list-group-item{{ if not $index }} active{{ end }}">
+                                                <i class="fas fa-download re pr-1"></i>
+                                                Download {{ $key }} installer
+                                                {{ if not $index }} (Recommended){{ end }}
+                                            </li>
+                                        </a>
+                                        {{ end }}
+                                        {{ end }}
+                                    </ul>
+                                </li>
+                                {{ end }}
+                                <li class="list-group-item">
+                                    {{ .Content }}
+                                </li>
+                                {{ end }}
+                            </ul>
+                        </div>
+                    </div>
+                    {{ end }}
+                </div>
+            </div>
+        </div>
+    </div>
+</main>
+{{ end }}