Demo server down

Demo server try.gitea.io is down because of such errors:
```
2018/07/27 23:45:19 [...gitea/models/repo.go:2337 CheckRepoStats()] [E] Update repository count 'num_watches'[6452]: database table is locked: repository
2018/07/27 23:45:23 [...les/indexer/issue.go:67 InitIssueIndexer()] [E] InitIssueIndexer: populate index, LoadAttributes: too many SQL variables
```