more refactoring

I got the color scheme and tree sitter into their own files.

lua/plugins/icons.lua

@@ -0,0 +1,16 @@
+return vim.g.have_nerd_font and {}
+  or {
+    cmd = '⌘',
+    config = '🛠',
+    event = '📅',
+    ft = '📂',
+    init = '⚙',
+    keys = '🗝',
+    plugin = '🔌',
+    runtime = '💻',
+    require = '🌙',
+    source = '📄',
+    start = '🚀',
+    task = '📌',
+    lazy = '💤 ',
+  }