[bilibili] update

- use self.groups[…] to access matched values
- extract more metadata (count, width, height, size)
- remove type hint
- add tests
- update docs/supportedsites

docs/supportedsites.md

@@ -133,6 +133,12 @@ Consider all listed sites to potentially be NSFW.
     <td>Collections, Galleries, User Profiles</td>
     <td></td>
 </tr>
+<tr>
+    <td>Bilibili</td>
+    <td>https://www.bilibili.com/</td>
+    <td>Articles, User Articles</td>
+    <td></td>
+</tr>
 <tr>
     <td>Bluesky</td>
     <td>https://bsky.app/</td>