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

config/platform.lua

@@ -0,0 +1,38 @@
+--          ╭─────────────────────────────────────────────────────────╮
+--          │                       OS OPTIONS                        │
+--          ╰─────────────────────────────────────────────────────────╯
+
+-- Load WezTerm module
+local wezterm = WEZTERM
+
+-- Define the opts table
+local opts = {}
+
+-- -- Get the OS string
+local os_string = wezterm.target_triple:lower()
+local myos = ""
+--
+-- -- Determine the OS
+if os_string:find("windows") then
+	myos = "win"
+else
+	if os_string:find("darwin") then
+		myos = "mac"
+	else
+		myos = "linux"
+	end
+end
+
+-- Set OS-specific options
+if myos == "win" then
+	opts.default_prog = { "pwsh.exe" }
+elseif myos == "mac" then
+	opts.default_prog = { "zsh" }
+else
+	opts.default_prog = { "fish" }
+end
+
+MYOS = myos
+
+-- Return the opts table
+return opts