refactor(neovim): Convert file-autocmd to after-ftplugin

- Markdown, gitcommit, text: `lua/shared/text_settings.lua`
- Javascript, Typescript, React, Vue:
  `lua/shared/javascript_settings.lua`
- `after/ftplugin` files that `require` the above 2 shared configs

common/.config/nvim/lua/shared/javascript_settings.lua

@@ -0,0 +1,24 @@
+local M = {}
+
+function M.setup()
+    vim.keymap.set({ "n", "v" }, "<leader>co", function()
+        vim.lsp.buf.code_action({
+            apply = true,
+            context = {
+                only = { "source.organizeimports.ts" },
+                diagnostics = {},
+            },
+        })
+    end, { desc = "Typescript: organize imports" })
+    vim.keymap.set({ "n", "v" }, "<leader>co", function()
+        vim.lsp.buf.code_action({
+            apply = true,
+            context = {
+                only = { "source.removeunused.ts" },
+                diagnostics = {},
+            },
+        })
+    end, { desc = "Typescript: remove unused imports" })
+end
+
+return M