fix(ci): fix travis ci release job

Merge branch 'master' into dev

Add Utterances comment system (ppoffice#625)

fix(layout): code block caption bar on safari

chore: merge master

fix(layout): no external links on anchor links

Merge remote-tracking branch 'origin/oom'

feat(layout): code block style fix and add folding

Update links to HTTPS and fix broken links (ppoffice#456)

* Update links to HTTPS

* Fix broken links

chore(widget): disable avatar rounding by default