try linking symlink files on every updot

This might be pretty repetitive, but it's fine enough as far as I'm
concerned. It's not like running updot is something that's going to
happen all the time (like several times a day), _and_ it's not like
updot isn't already pretty repetitive, with the output from brew bundle
and all that.

script/bootstrap

@@ -3,7 +3,6 @@
 #
 # bootstrap the entire dotfiles experience on this computer
 # but safe to run periodically
-# (n.b. this is the main way to automatically handle .symlink files)
 
 set -e
 

system/install.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+set -e
+
+cd "$(dirname "$0")/.."
+# need to get the canonical path, not just ~/.dotfiles
+DOTFILES_ROOT=$(pwd -P)
+
+source "$DOTFILES_HOME/script/helpers/printing.sh"
+source "$DOTFILES_HOME/script/helpers/linking.sh"
+
+link_dotfiles () {
+    info 'linking dotfiles'
+
+    local overwrite_all=false backup_all=false skip_all=false
+
+    for src in $(find $DOTFILES_ROOT -name '*.symlink' -type f)
+    do
+        dst="$HOME/.$(basename ${src%.symlink})"
+        link_file $src $dst
+    done
+}
+
+link_dotfiles