Revert f10efdd863f578399806a913d5023407fd54d183 and e88f8472c53e46d6f1c47b6d4dc3eb0412d9d0f4.

The outline is useful for accessibility.
index.rst: add an abbr for MPC-HC
Show the RSS icon before the latest news header.
rename logo.png to logo-128x128.png