feat(nvim): setup for ipynb dev work

Setup:
- molten (run python code)
- otter (lsp in markdown codeblocks)
- jupytext (convert .ipynb files to .md files transparently)
- image (display images inside neovim (e.g. matplotlib graphs))

nvim/plugins.nix

@@ -160,6 +160,15 @@ in
       };
     };
     gitsigns.enable = true;
+    image.enable = true;
+    jupytext = {
+      enable = true;
+      settings.custom_language_formatting.python = {
+        extension = "md";
+        style = "markdown";
+        force_ft = "markdown";
+      };
+    };
     lint = {
       enable = true;
       lintersByFt = {
@@ -214,6 +223,15 @@ in
       enable = true;
       settings.update_events = "TextChanged,TextChangedI";
     };
+    molten = {
+      enable = true;
+      settings = {
+        image_provider = "image.nvim";
+        virt_text_output = true;
+        molten_auto_open_output = false;
+        molten_virt_lines_off_by_1 = true;
+      };
+    };
     noice = {
       enable = true;
       lsp.override = {
@@ -245,6 +263,7 @@ in
         mode = "virtualtext";
       };
     };
+    otter.enable = true;
     rustaceanvim = {
       enable = true;
       # Install through rustup
@@ -260,6 +279,7 @@ in
     treesitter = {
       enable = true;
       settings = {
+        highlight.enable = true;
         indent.enable = true;
         incremental_election.enable = true;
       };

nvim/standalone.nix

@@ -62,6 +62,7 @@
       pkgs.unstable.typos
       pkgs.unstable.yamlfmt
     ];
+    extraPython3Packages = p: [ p.jupytext ];
     extraConfigLuaPre =
       # lua
       ''