Ssh, disable DefaultConfig to supress warning

This merges all the different files into one app.nix using nixvim
instead of the manual home-manager nvim management.

Behavior should be almost unchanged, with the following changes:
- Plugins now have defaults for my own personal sane default experience
- The highlighted line is now 81 instead of 80
- Treesitter plugins may not be integrated correctly

hmModules/apps/neovim/app.nix

@@ -68,11 +68,11 @@
         smartcase = true;
       };
 
-      keymaps = [
+      keymaps = with config.lib.nixvim; [
         {
           key = "<leader>d";
           mode = "n";
-          action = "vim.diagnostic.open_float()";
+          action = mkRaw "vim.diagnostic.open_float";
         }
         # -- Easy Split Navigation
         # -- nnoremap <C-J> <C-W><C-J>
@@ -111,50 +111,20 @@
       cmp = {
         enable = nvimcmp.enable;
         autoEnableSources = true;
-        settings.sources = [
-          { name = "nvim_lsp"; }
-          { name = "path"; }
-          { name = "buffer"; }
-        ] ++ lib.optional luasnip.enable { name = "cmp-luasnip"; };
+          settings = {
+            sources = [
+            { name = "nvim_lsp"; }
+            { name = "path"; }
+            { name = "buffer"; }
+          ] ++ lib.optional luasnip.enable { name = "cmp-luasnip"; };
 
-        mapping = {
-          "<C-Space>" = "cmp.mapping.complete {}";
-          "<CR>" = "cmp.mapping.confirm {
-            behavior = cmp.ConfirmBehavior.Replace,
-            select = true,
-          }";
-          "<Tab>" = {
-            actions = ''
-              function(fallback)
-                if cmp.visible() then
-                  cmp.select_next_item()
-            '' + lib.optionalString luasnip.enable ''
-                elseif luasnip.expand_or_locally_jumpable() then
-                  luasnip.expand_or_jump()
-            '' + ''
-                else
-                  fallback()
-                end
-              end
-            '';
-            modes = [ "i" "s" ];
-          };
-          "<S-Tab>" = {
-            actions = ''
-              function(fallback)
-                if cmp.visible() then
-                  cmp.select_prev_item()
-            '' + lib.optionalString luasnip.enable ''
-                elseif luasnip.locally_jumpable(-1) then
-                  luasnip.jump(-1)
-            '' + ''
-                else
-                  fallback()
-                end
-              end
-            '';
-            modes = [ "i" "s" ];
-          };
+          mapping = with config.lib.nixvim; {
+            "<C-Space>" = mkRaw "cmp.mapping.abort()";
+            "<Tab>" = mkRaw
+              "cmp.mapping(cmp.mapping.select_next_item(), {'i', 's'})";
+            "<S-Tab>" = mkRaw
+              "cmp.mapping(cmp.mapping.select_prev_item(), {'i', 's'})";
+            };
         };
       };
 
@@ -179,7 +149,7 @@
         enable = treesitter.enable;
         highlight.enable = true;
         indent.enable = true;
-        folding.enable = true;
+        folding.enable = false;
       };
 
       vimwiki = {