feat: Add announcement bar configuration

- Add AnnouncementBar struct and field to Configuration
- Add announcement.json file generation
- Implement play_announcement function for importing announcement config
- Improve fix_links to calculate relative paths dynamically
- Escape single quotes in YAML frontmatter fields

lib/web/site/model_siteconfig.v

@@ -27,6 +27,18 @@ pub mut:
 
 	build_dest     []BuildDest // Production build destinations (from !!site.build_dest)
 	build_dest_dev []BuildDest // Development build destinations (from !!site.build_dest_dev)
+
+	announcement AnnouncementBar // Announcement bar configuration (from !!site.announcement)
+}
+
+// Announcement bar config structure
+pub struct AnnouncementBar {
+pub mut:
+	id               string @[json: 'id']
+	content          string @[json: 'content']
+	background_color string @[json: 'backgroundColor']
+	text_color       string @[json: 'textColor']
+	is_closeable     bool   @[json: 'isCloseable']
 }
 
 // Footer config structures
@@ -73,7 +85,7 @@ pub mut:
 	ssh_name string
 }
 
-//is to import one docusaurus site into another, can be used to e.g. import static parts from one location into the build one we are building
+// is to import one docusaurus site into another, can be used to e.g. import static parts from one location into the build one we are building
 pub struct ImportItem {
 pub mut:
 	name    string // will normally be empty

lib/web/site/play.v

@@ -50,6 +50,7 @@ pub fn play(mut plbook PlayBook) ! {
 	play_import(mut plbook, mut config)!
 	play_menu(mut plbook, mut config)!
 	play_footer(mut plbook, mut config)!
+	play_announcement(mut plbook, mut config)!
 	play_publish(mut plbook, mut config)!
 	play_publish_dev(mut plbook, mut config)!
 	play_pages(mut plbook, mut website)!
@@ -178,6 +179,25 @@ fn play_footer(mut plbook PlayBook, mut config SiteConfig) ! {
 	}
 }
 
+fn play_announcement(mut plbook PlayBook, mut config SiteConfig) ! {
+	mut announcement_actions := plbook.find(filter: 'site.announcement')!
+	if announcement_actions.len > 0 {
+		// Only process the first announcement action
+		mut action := announcement_actions[0]
+		mut p := action.params
+
+		config.announcement = AnnouncementBar{
+			id:               p.get_default('id', 'announcement')!
+			content:          p.get_default('content', '')!
+			background_color: p.get_default('background_color', '#20232a')!
+			text_color:       p.get_default('text_color', '#fff')!
+			is_closeable:     p.get_default_true('is_closeable')
+		}
+
+		action.done = true // Mark the action as done
+	}
+}
+
 fn play_publish(mut plbook PlayBook, mut config SiteConfig) ! {
 	mut build_dest_actions := plbook.find(filter: 'site.publish')!
 	for mut action in build_dest_actions {