GDPR: Adds disclosure and consent withdrawal information in privacy tab

[SaptakS]

Description

Adds the following information in the privacy settings

• disclose The purposes for collecting the information and how it will be used (e.g., provide updates, marketing)
• add 'Notice that the user may withdraw consent at any time and instructions on how to do so (e.g., by clicking an unsubscribe link in the email or contacting the spoke directly)'
• our privacy contact info

Checklist

• linter status: 100% pass
• changes don't break existing behavior
• commit message follows commit guidelines

Affected core subsystem(s)

Testing

Following is the screenshot:

Refers/Fixes

Fixes #1235

[codecov]

Codecov Report

Merging #1248 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1248      +/-   ##
==========================================
- Coverage   31.53%   31.49%   -0.04%     
==========================================
  Files         118      118              
  Lines        8192     8192              
  Branches     1069     1069              
==========================================
- Hits         2583     2580       -3     
- Misses       5499     5502       +3     
  Partials      110      110

Impacted Files	Coverage Δ
app/app/settings.py	83.61% <0%> (-1.7%)	⬇️

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[mbeacom]

lgtm

[SaptakS]

Merge this only after #1246 is merged. Else due to failure in finding reverse_url for account_settings the privacy page will fail to load. It depends on this change

[thelostone-mc]

LGTM

[mbeacom]

lgtm