Remove redundant signin link from signin page.

Typo fix

Updated CI error message so that it makes more sense

Add help link to header.

Notes are comments

Forgot import readme

/cc @dzaporozhets

Import check

/cc @dzaporozhets

Slack doc readme

Refresh Notes unless the tab is hidden

do not html encode plaintext part of emails for push notifications

Fix unclear text in broadcast message view.

editing preview

Added Node.js library link

NotesFinder filters by updated_at

Users who have not refreshed their browser tab will poll GitLab using
outdated JS. This change makes the server fall back to the old behavior
(send all comments) for old clients, instead of throwing an exception
for old clients.

fix init.d script copy duplication

Copy init.d script twice in the guide. Deleted the second one.