fix image build for statictendril
This change fixes some minor errors in the blubber image build:
- move used directory from
/srv/org/wikimedia/static-tendril
to/srv/app/html/statictendril
- remove redirect to
443
- remove custom and errorlog, use
/dev/stderr
- rename html file form
static-tendril-index.html
toindex.html
- rename blubber variant from
bienvenida
tostatictendril
- user port
8080
instead of80
Bug: T340182