community/gitea: add link to configuration cheat sheet

It always comes in handy.
7 jobs for !5777 with gitea-cheat-sheet in 18 minutes and 3 seconds
detached
Status Job ID Name Coverage
  Lint
passed #82519
x86_64 docker-alpine
lint

00:00:44

 
  Build
passed #82524
aarch64 ci-build docker-alpine
build-aarch64

00:09:30

passed #82525
armv7 ci-build docker-alpine
build-armv7

00:17:17

passed #82523
ppc64le ci-build docker-alpine
build-ppc64le

00:11:13

canceled #82522
s390x ci-build docker-alpine
build-s390x

passed #82521
x86 ci-build docker-alpine
build-x86

00:01:57

passed #82520
x86_64 ci-build docker-alpine
build-x86_64

00:01:41