Remove Facebook and RSS links from footer

[jazairi]

Why these changes are being introduced:

Communications have requested that we remove these links.

Relevant ticket(s):

https://mitlibraries.atlassian.net/browse/UXWS-1507

How this addresses that need:

This removes the links from the footer layout.

Side effects of this change:

None.

Developer

• All new ENV is documented in README
• All new ENV has been added to Heroku Pipeline, Staging and Prod
• ANDI or Wave has been run in accordance to
  our guide and
  all issues introduced by these changes have been resolved or opened as new
  issues (link to those issues in the Pull Request details above)
• Stakeholder approval has been confirmed (or is not needed)

Code Reviewer

• The commit message is clear and follows our guidelines
  (not just this pull request message)
• There are appropriate tests covering any new functionality
• The documentation has been updated or is unnecessary
• The changes have been verified
• New dependencies are appropriate or there were no changes

Requires database migrations?

NO

Includes new or updated dependencies?

NO

[coveralls]

Pull Request Test Coverage Report for Build 4578979797

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 88.372%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/mitlibraries/theme/version.rb	0	1	0.0%

Totals
Change from base Build 4440645644:	0.0%
Covered Lines:	38
Relevant Lines:	43

---

💛 - Coveralls