Change UI to be more similar to current extension: footer

[buberdds]

• add fixed menu to footer
• tweak footer css for mobile

[github-actions]

MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ EDITORCONFIG	editorconfig-checker	5		0	0.01s
✅ GIT	git_diff	yes		no	0.01s
✅ TSX	eslint	4	0	0	6.71s

See errors details in artifact MegaLinter reports on CI Job page
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

[codecov]

Codecov Report

Merging #933 (6b1b0d7) into master (a62273b) will increase coverage by 0.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #933      +/-   ##
==========================================
+ Coverage   87.59%   87.74%   +0.15%     
==========================================
  Files          97       98       +1     
  Lines        1620     1640      +20     
  Branches      353      358       +5     
==========================================
+ Hits         1419     1439      +20     
  Misses        201      201              

Flag	Coverage Δ
cypress	58.06% <76.19%> (+0.21%)	⬆️
jest	74.52% <100.00%> (+0.31%)	⬆️

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Impacted Files	Coverage Δ
src/app/components/Footer/index.tsx	100.00% <100.00%> (ø)
...rc/app/components/MobileFooterNavigation/index.tsx	100.00% <100.00%> (ø)

[lukaw3d]

Nice!