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

nvim/plugin/demicolon.lua

@@ -0,0 +1,8 @@
+vim.schedule(function()
+    vim.pack.add({ "https://github.com/mawkler/demicolon.nvim" })
+    require("demicolon").setup({
+        keymaps = {
+            repeat_motions = "stateful",
+        },
+    })
+end)