feat: Add support for Tella.tv embed mapping (#9775)

* feat: Add support for Tella.tv embed mapping

* Optimised images with calibre/image-actions

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

shared/editor/embeds/index.tsx

@@ -586,6 +586,16 @@ const embeds: EmbedDescriptor[] = [
     icon: <Img src="/images/spotify.png" alt="Spotify" />,
     component: Spotify,
   }),
+  new EmbedDescriptor({
+    title: "Tella",
+    keywords: "video",
+    regexMatch: [/^https?:\/\/(?:www\.)?tella\.tv\/video\/([a-z0-9]+)(.*)?$/],
+    transformMatch: (matches: RegExpMatchArray) =>
+      `https://www.tella.tv/video/${matches[1]}/embed?b=0&title=1&a=0&loop=0&t=0&muted=0&wt=1`,
+    icon: <Img src="/images/tella.png" alt="Tella" />,
+    defaultHidden: true,
+    hideToolbar: true,
+  }),
   new EmbedDescriptor({
     title: "Tldraw",
     keywords: "draw schematics diagrams",