moved nixvim to home-manager config, re-added firefox plugins

modules/home/programs/nixvim/autocmd.nix

@@ -0,0 +1,36 @@
+{...}: {
+  programs.nixvim = {
+    autoCmd = [
+      {
+        command = "FloatermNew --wintype=float --name=shadeterm --position=topright --autoclose=0 --silent --cwd=<buffer> --titleposition=left zsh";
+        event = ["VimEnter"];
+        pattern = ["*"];
+        desc = "Create a floating terminal, placed in the top right";
+      }
+      {
+        command = "silent! mkview";
+        event = ["BufWinLeave"];
+        pattern = ["*"];
+        desc = "Save session window settings to be loaded next time the file is opened";
+      }
+      {
+        command = "silent! !aplay ~/sound/sys/cd.wav > /dev/null 2>&1 &";
+        event = ["BufWinLeave"];
+        pattern = ["*"];
+        desc = "Play a neat little sound effect when you close neovim";
+      }
+      {
+        command = "silent! loadview";
+        event = ["BufWinEnter"];
+        pattern = ["*"];
+        desc = "Load previous session window settings for the opened file (folds, cursor pos, etc)";
+      }
+      {
+        command = "setlocal textwidth=135";
+        event = ["BufWinEnter" "BufEnter"];
+        pattern = ["*.md" "*.wiki" "*.txt"];
+        desc = "Set automatic linebreaks in plain text file formats";
+      }
+    ];
+  };
+}