feat: Add user customization and refactor for readability

- Add user customization via automatically detected user.lua file
- Reorganize config options into separate files
- Reorganize plugin loaders into separate files

plugs.lua

@@ -0,0 +1,17 @@
+--          ╭─────────────────────────────────────────────────────────╮
+--          │                         PLUGINS                         │
+--          ╰─────────────────────────────────────────────────────────╯
+
+-- List of plugins to load
+local plugins = {
+	"battery",
+	"hyperlinks",
+	"resurrect",
+	"smart_splits",
+	"tabline",
+}
+
+-- Load all plugins
+for _, plugin in ipairs(plugins) do
+	require("plugins." .. plugin)
+end