Fix/about caselaw page update

[Terry-Price]

• Made changes and additions to the footer
• Created a 'Privacy Notice' page – not linked from footer yet as it needs Director level sign off, but when it is, it will sit in leagl column under the Cookies link.
• Made wholesale changes to the 'What to expect page' and renamed it 'About this service'.
• Took link out of page header and moved it to the footer under 'About' column.

Changes in this PR:

Trello card / Rollbar error (etc)

https://trello.com/c/OYVqgxKh/748-fcl-policies-all-ducks-in-a-row-%F0%9F%A6%86

Screenshots of UI changes:

Before

After

• Requires env variable(s) to be updated

[timcowlishaw]

I've just had to make a fair few changes to this myself as a result of rebasing on master, so will defer to @jacksonj04 @anthonyhashemi or @dragon-dxw for explicit approval!

[codecov-commenter]

Codecov Report

Merging #725 (8548d4a) into main (3cf9322) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #725   +/-   ##
=======================================
  Coverage   92.19%   92.19%           
=======================================
  Files          25       25           
  Lines        1102     1102           
  Branches       55       55           
=======================================
  Hits         1016     1016           
  Misses         72       72           
  Partials       14       14           

Impacted Files	Coverage Δ
judgments/tests/tests.py	96.81% <100.00%> (ø)

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[jacksonj04]

I'm happy with this as far as the code goes. I can't speak to the substance of the text, but nothing looks obviously wrong.