docs: add install terminal widget to README + logo to v6.0.0 release page

- Front-page README: styled one-line-install terminal graphic (ports the
  ourlifeos.ai install widget), pointing at ourlifeos.ai/install.sh
- Releases/v6.0.0 page: LifeOS logo at the top

Author: danielmiessler

README.md

@@ -169,6 +169,12 @@ We very much believe in AI-based installation and modification of LifeOS. Once y
 
 ### One-line install (recommended)
 
+<div align="center">
+
+<a href="https://ourlifeos.ai"><img src="./images/lifeos-install.png" alt="curl -fsSL https://ourlifeos.ai/install.sh | bash" width="720"></a>
+
+</div>
+
 ```bash
 curl -fsSL https://ourlifeos.ai/install.sh | bash
 ```

Releases/v6.0.0/README.md

@@ -1,5 +1,9 @@
 <div align="center">
 
+<img src="https://raw.githubusercontent.com/danielmiessler/LifeOS/main/images/lifeos-logo.png" alt="LifeOS" width="200">
+
+<br/>
+
 # LifeOS 6.0.0
 
 **The first release under the LifeOS name — and the whole system now ships as one self-contained skill.**