Align in-page links design with the Design System.

In-page links are also known as anchor links that take users to a specific section of the same page visited. There are 2 types of in-page links used for Planet 4: Table of content, used in the sub-menu block, and secondary in-page links such as the "comments" anchor link.

Tasks:

• change the link & icons color for passive, hover & onclick (active) states.
• remove italic style (for the secondary in-page link).
• replace the comment icon (for the secondary in-page link, asset available in Sketch) and implement it as a SVG icon.