Merge pull request #4430 from svbergerem/add-no-comments-message-to-spv

Add 'no comments' message to SPV
Adding hover icoons for notifications & conversations

Added white versions of the icons on hover to match the hover of other
header items.
Changing the notifications hover icon to the regular notifications icon when active so
it is visible with the white background.

Fixing the hard coded background-position value for notifications_grey

Can not depend on generated sprite background position as it will change
with changes in icons

Moving the $icons variable to a broader scope

Since the variable is used in the header, the sprites now are imported
before the header

Using the default sprite map instead of the explicitly created sprite map
Merge branch 'ssrihari-header_icons_hover' into develop
add consistent spacing to paragraphs in the SPV
update header and footer links
drop outdated hints from right sections
update branding
Merge pull request #4438 from MrZYX/spv_paragraph_spacing

add consistent spacing to paragraphs in the SPV
Merge pull request #4434 from MrZYX/links_and_branding

Links and branding
Add aspect modification and fix check icon regression on contacts page, close #4397
add gem updates to changelog [ci skip]
Merge pull request #4440 from Flaburgan/fix-contacts-page

Add aspect modification and fix check icon regression on contacts page, close #4397
add help page