docs(index): Skip README header block and add explicit title

why: README's HTML header (logo, badges) is GitHub-specific and redundant in Sphinx docs
what:
- Add `# libvcs` heading to provide page title
- Use `:start-after: </div>` to skip the centered header block
- Content now starts with the description paragraph

Author: tony

docs/index.md

@@ -1,7 +1,9 @@
 (index)=
 
-```{include} ../README.md
+# libvcs
 
+```{include} ../README.md
+:start-after: </div>
 ```
 
 ```{toctree}