Add post synchronization functionality for Markdown files

- Implemented a parser for YAML front-matter in Markdown files.
- Developed functions to convert Markdown content to HTML.
- Created a pipeline to sync WordPress posts from a specified folder in a Git repository.
- Added media import capabilities to handle images referenced in Markdown.
- Implemented author resolution and post slug generation.
- Included error handling and logging for sync operations.
- Enabled trashing of posts that are no longer present in the repository.

uninstall.php

@@ -17,10 +17,12 @@ delete_option( 'oribi_sync_log' );
 delete_option( 'oribi_sync_webhook_secret' );
 delete_option( 'oribi_sync_theme_applied' );
 delete_option( 'oribi_sync_push_log' );
+delete_option( 'oribi_sync_posts_enabled' );
+delete_option( 'oribi_sync_posts_folder' );
 
-// Remove sync metadata from posts
+// Remove sync metadata from pages and posts
 $posts = get_posts( [
-    'post_type'      => 'page',
+    'post_type'      => [ 'page', 'post' ],
     'post_status'    => 'any',
     'posts_per_page' => -1,
     'meta_key'       => '_oribi_sync_checksum',
@@ -36,5 +38,17 @@ foreach ( $posts as $post_id ) {
     delete_post_meta( $post_id, '_oribi_sync_pr_url' );
 }
 
+// Remove origin src meta from media attachments
+$attachments = get_posts( [
+    'post_type'      => 'attachment',
+    'post_status'    => 'any',
+    'posts_per_page' => -1,
+    'meta_key'       => '_oribi_sync_origin_src',
+    'fields'         => 'ids',
+] );
+foreach ( $attachments as $att_id ) {
+    delete_post_meta( $att_id, '_oribi_sync_origin_src' );
+}
+
 // Clear any scheduled cron
 wp_clear_scheduled_hook( 'oribi_sync_cron_run' );