Add example config for local wikis
Add example config for local wikis

Add an example config for typical local RESTBase installs:

- use `http://localhost/w/api.php` as the API URI
- use `localhost` as the domain
- use `http://localhost:8142/` as the parsoid url (matching the Debian
  package, plus a comment about using port 8000 if using a git checkout)
- configure the sqlite backend

Task: https://phabricator.wikimedia.org/T109669

wikimedia/restbase,inverno/restbase,Krenair/restbase,wikimedia/mediawiki-services-restbase,d00rman/restbase,Pchelolo/restbase,d00rman/restbase,milimetric/restbase,wikimedia/hyperswitch,inverno/restbase,milimetric/restbase,gwicke/restbase,wikimedia/restbase,eevans/restbase,gwicke/restbase,cscott/restbase,Pchelolo/restbase,wikimedia/mediawiki-services-restbase,eevans/restbase,Krenair/restbase,cscott/restbase