Add terms page to footer

[kkartunov]

Link https://www.topcoder.com/community/terms as "Terms" in the footer. It should be the last Item under "About".

[Jobee1]

Verified in Test environment.

Attached screenshot for reference:

[lakshmiathreya]

@SathyaJayabal @kkartunov let's close this only after assigning the correct milestone.

[SathyaJayabal]

verified on prod