feat(oembed.php): add oembed api and implement in dependent pages

src/meta/htaccess.liquid

@@ -50,6 +50,9 @@ RewriteRule ^tags/([^/]+)(?:/([0-9]+))?/?$ tags/index.php [L]
 ## open graph assets
 RewriteRule ^og/([a-z0-9\-]+)/([\d\.]+)/([a-f0-9\-]+)\.([a-z0-9]+)$ /api/og-image.php?id=$3&class=$1&v=$2&extension=$4 [L]
 
+## oembed
+RewriteRule ^oembed/(.*)$ /api/oembed.php?url=https://www.coryd.dev/$1 [L,QSA]
+
 {% for redirect in redirects -%}
 Redirect {{ redirect.status_code | default: "301" }} {{ redirect.source_url }} {{ redirect.destination_url }}
 {% endfor -%}