Privacy page simplification

[wen-2018]

One-line summary

• I used an AI to write some of this code.

Significant changes and points to review

• Simplify page content, remove unused assets and styles
• update page content with new layout
• update page styles
• add new localization string
• remove unused import and sub-nav
• remove sub pages and their assets
• remove obsolete ftl strings

Issue / Bugzilla link

#14248

Testing

http://localhost:8000/en-US/firefox/privacy/

[stephaniehobson]

Very through clean up. I love seeing all the code being removed 🧹

A couple quick changes and this'll be good to go.

[janbrasna]

There are also functional tests associated:

bedrock/tests/functional/firefox/privacy/test_products.py

Lines 7 to 14 in ddcf11c

	from pages.firefox.privacy.products import FirefoxPrivacyProductsPage
	@pytest.mark.smoke
	@pytest.mark.skip_if_firefox(reason="Download buttons are shown to non-Firefox browsers only")
	@pytest.mark.nondestructive
	def test_download_button_displayed(base_url, selenium):
	page = FirefoxPrivacyProductsPage(selenium, base_url).open()

that ought to be removed with the page gone now.

Besides that only a couple of further cleanup ideas:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.16%. Comparing base (7077dbc) to head (121485f).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14688      +/-   ##
==========================================
- Coverage   77.17%   77.16%   -0.01%     
==========================================
  Files         159      159              
  Lines        8245     8246       +1     
==========================================
  Hits         6363     6363              
- Misses       1882     1883       +1     

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