Multiple changes (cleanup, remove edison, add felixalbpc)

- Removes hold host edison
- Adds new host, felixalbpc, a work machine. This requires some cleanup
  to fit into the office network, use other SSH keys, etc.
- Clean up some package installs, putting more things into the common
  home-manager packages, rather than systemwide or host-specific homes.
- Various small changes like disabling Github Copilot on nvim startup.

home/zsh.nix

@@ -14,6 +14,8 @@
           pwdLength = "long";
           showReturnVal = true;
         };
+        history.extended = true;
+        historySubstringSearch.enable = true;
         terminal.autoTitle = true;
 
         pmodules = [
@@ -28,7 +30,6 @@
           "git"
           "autosuggestions"
           "syntax-highlighting"
-          "history-substring-search"
           "prompt"
         ];
       };