Refactor the Cotton Candy front-end onto Bootstrap

[bartfeenstra]

This fixes #908
This fixes #717

To-dos

• Reduce the Bootstrap imports to those components we actually use
• Ensure person meta is responsive
• Refactor entity lists
• Refactor featured maps
• Refactor the primary navigation
• Refactor the locale navigation
• Refactor the search
• Finetune the typography

[codecov]

Codecov Report

Merging #918 (9666df5) into 0.3.x (85d56ed) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            0.3.x     #918      +/-   ##
==========================================
+ Coverage   89.39%   89.42%   +0.02%     
==========================================
  Files          44       44              
  Lines        3800     3800              
==========================================
+ Hits         3397     3398       +1     
+ Misses        403      402       -1     

Impacted Files	Coverage Δ
betty/jinja2.py	74.92% <ø> (ø)
betty/model/ancestry.py	88.04% <0.00%> (+0.20%)	⬆️

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[github-actions]

🍎 Uploaded betty.app.zip for commit 5fa8991. You can download it, test it on Mac OS, and post your feedback in a comment to this pull request 💕

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[github-actions]

🪟 Uploaded betty.exe.zip for commit 5fa8991. You can download it, test it on Windows, and post your feedback in a comment to this pull request 💕

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[github-actions]

🪟 Uploaded betty.exe.zip for commit e582e23. You can download it, test it on Windows, and post your feedback in a comment to this pull request 💕

The download will disappear once this pull request is merged, or when it is being rebuilt after a new commit.

[github-actions]

🍎 Uploaded betty.app.zip for commit ce428d9. You can download it, test it on Mac OS, and post your feedback in a comment to this pull request 💕

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[bartfeenstra]

Closing this in favor of #1003