Design-plone-theme

------------------

- Added selector for mimetypes icons [nzambello]

------------------

- Fixed selector for mimetypes icons [nzambello]

------------------

- Added selector for mimetypes icons [nzambello]

------------------

- Updated styles for new tiles management UI (https://github.com/RedTurtle/redturtle.tiles.management/pull/12) [nzambello]
- Added login button in header banner viewlet shown if an option in controlpanel is selected [nzambello]
- Used <h2> for tile titles and extended those styles for h2 [nzambello]
- Changed styles for leadimage [nzambello]
- Added social icons for footer [nzambello]

------------------

BREAKING CHANGES:

- Changed package name from redturtle.agidtheme to design.plone.theme to adhere to the standards of github.com/italia [nzambello]
- Removed old upgrade steps
- Removed old profiles

Other changes:

- Fix uninstall step [cekk]
- Update of the "font_size_base" variable [fdelia]
- Added an override of plone-logged-in js resource to fix toolbar pattern [nzambello]

------------------

- Improved translation for header social viewlet
[eikichi18]