Add the svgs/solid/dot-circle.svg icon from FontAwesome

FontAwesome icons are licensed under CC BY 4.0 and are
available from https://github.com/FortAwesome/Font-Awesome.git

The svgs/solid/dot-circle.svg from repository tag 5.10.2
(commit 090e6148d3f63a45b40e7cd8679bd4d64e58d75d) was used for this commit.

Differential Revision: https://phabricator.kde.org/D23532