Add ADR datatable page

[patphongs]

Summary

• Resolves Implement ADR datatable page #2436
  This adds ADR datatable page to the enforcement legal features.

How to test

1. vi ~/.bash_profile and insert this feature flag for ADRs export FEC_FEATURE_ADRS=true
2. Open a new terminal window and run the branch
3. Go to http://localhost:8000/data/legal/search/adrs/ to test the page. At this point, none of the canonical ADR links will work since that is phase 2 of the development for this feature.

Impacted areas of the application

List general components of the application that this PR will affect:

• Enforcement ADR datatable page

Screenshots

[codecov-io]

Codecov Report

Merging #2440 into develop will decrease coverage by 0.02%.
The diff coverage is 33.33%.

@@             Coverage Diff             @@
##           develop    #2440      +/-   ##
===========================================
- Coverage    74.25%   74.23%   -0.03%     
===========================================
  Files          111      111              
  Lines         6645     6659      +14     
  Branches       591      591              
===========================================
+ Hits          4934     4943       +9     
- Misses        1711     1716       +5

Impacted Files	Coverage Δ
fec/fec/settings/base.py	88.75% <ø> (ø)	⬆️
fec/legal/views.py	56.16% <11.11%> (-6.34%)	⬇️
fec/data/api_caller.py	35.23% <66.66%> (+0.15%)	⬆️
fec/legal/urls.py	83.33% <66.66%> (-16.67%)	⬇️
fec/fec/static/js/modules/toc.js	100% <0%> (+12.82%)	⬆️

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[patphongs]

@JonellaCulmer The additional datatable items noted here: #2436 (comment) have been added to this PR. Please do another design review.

[JonellaCulmer]

Looks, great! Thanks, @patphongs

[lbeaufort]

Looks great, @patphongs! I also think the results look great - nice design work @JonellaCulmer

Noting a small issue we discussed that shouldn't be a big issue - the ADR search says “keyword match” when we’re not searching on keywords:

[lbeaufort]

I also confirmed that the feature flag worked properly - I did need to unset it, as setting it to false didn't seem to work @patphongs

[patphongs]

I also confirmed that the feature flag worked properly - I did need to unset it, as setting it to false didn't seem to work

Thanks @lbeaufort. The feature flags are strange in that the environment setting is checking for the existence of the feature flag, so technically you can set it to anything (not necessarily a boolean) and it would work. That logic should probably be fixed at some point, it can be confusing.