Merge branch 'edit-readme' into 'master'

Show edit readme from project home page

I added pencil icon which redirect you to edit README page (web editor). In this case people can make changes to README easily without going to Files tab, searching for README and pressing edit button here

cc @job  @darby 

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !1892