migrate nvim config to 0.12.0: vim.pack, ui2, snacks -> mini, just general spring cleaning

nvim/plugin/00-hooks.lua

@@ -0,0 +1,11 @@
+vim.api.nvim_create_autocmd("PackChanged", {
+    callback = function(ev)
+        local name = ev.data.spec.name
+        local kind = ev.data.kind
+
+        if name == "nvim-treesitter" and (kind == "install" or kind == "update") then
+            if not ev.data.active then vim.cmd.packadd("nvim-treesitter") end
+            vim.cmd("TSUpdate")
+        end
+    end,
+})