feat: add nvim-pager package

package/nvim-pager.nix

@@ -0,0 +1,14 @@
+{ pkgs, ... }:
+pkgs.writeShellScriptBin "pager" ''
+    nvim -R --clean -c 'set buftype=nofile' -c 'nnoremap q :q!<CR>' -c 'set nowrap' \
+        -c 'set runtimepath^=${pkgs.vimPlugins.vim-plugin-AnsiEsc}' \
+        -c 'runtime! plugin/*.vim' -c 'AnsiEsc' -
+    #                  ^^^^^^^^^^^^^^^^^^^^
+    #                  Prevents Neovim from treating the buffer as a file
+    #                                          ^^^^^^^^^^^^^^^^^^^^
+    #                                          Makes 'q' quit Neovim immediately
+    #                                                                   ^^^^^^^^^^^
+    #                                                        Disables text wrapping
+    #      ^^^^^^^^
+    #      Enables ANSI color interpretation
+''