WT-786 smart window changes

[wen-2018]

If this changeset needs to go into the FXC codebase, please add the WMO and FXC label.

One-line summary

This PR adds Smart Window ToU and Privacy Notice.

Significant changes and points to review

Issue / Bugzilla link

https://mozilla-hub.atlassian.net/browse/WT-786

Testing

http://localhost:8000/en-US/about/legal/terms/smart-window/
http://localhost:8000/en-US/privacy/smart-window/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.85%. Comparing base (028aa59) to head (583f6ab).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #17056   +/-   ##
=======================================
  Coverage   81.85%   81.85%           
=======================================
  Files         175      175           
  Lines        9409     9410    +1     
=======================================
+ Hits         7702     7703    +1     
  Misses       1707     1707           

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[stevejalim]

LGTM - tested locally