refactor: Improve site configuration and navigation handling

- Consolidate site configuration loading and parsing
- Refactor navbar and menu item processing logic
- Add console output for configuration steps
- Update copyright year dynamically
- Simplify and clarify parameter handling
- Enhance error handling for missing required parameters

lib/web/docusaurus/dsite.v

@@ -71,9 +71,9 @@ pub struct DevArgs {
 pub mut:
 	host          string = 'localhost'
 	port          int    = 3000
-	open          bool   = true  // whether to open the browser automatically
-	watch_changes bool   = false // whether to watch for changes in docs and rebuild automatically
-	skip_generate bool   = false // whether to skip generation (useful when docs are pre-generated, e.g., from atlas)
+	open          bool   = true // whether to open the browser automatically
+	watch_changes bool // whether to watch for changes in docs and rebuild automatically
+	skip_generate bool // whether to skip generation (useful when docs are pre-generated, e.g., from atlas)
 }
 
 pub fn (mut s DocSite) open(args DevArgs) ! {