fix: Formatting blockquotes in datatrackers rendered markdown

[holloway]

This adds a utility class for HTML blobs of content (ie dynamic content...content that we can't add classes) to format <blockquote>.

In the following example the "text" is a blockquote which has padding-left and border-left:

Fixes https://github.com/orgs/ietf-tools/projects/3/views/4?pane=issue&itemId=58443314

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.92%. Comparing base (187c2c5) to head (649a404).
Report is 232 commits behind head on main.

❗ Current head 649a404 differs from pull request most recent head 879a81f

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7500      +/-   ##
==========================================
- Coverage   88.98%   88.92%   -0.07%     
==========================================
  Files         291      295       +4     
  Lines       40717    41224     +507     
==========================================
+ Hits        36233    36657     +424     
- Misses       4484     4567      +83     

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[rjsparks]

This gets one place where we are rendering markdown - would be format all the places.

[holloway]

@rjsparks which other ones should be updated? All the document_* templates?

document_ballot_content.html   document_draft.html           document_material.html       document_status_change.html
document_ballot.html           document_email.html           document_polls.html          document_subseries.html
document_bibtex.bib            document_format_buttons.html  document_referenced_by.html  document_subseries_top.html
document_bofreq.html           document_history_form.html    document_references.html     document_top.html
document_charter.html          document_history.html         document_review.html         document_writeup.html
document_chatlog.html          document_html.html            document_rfc.html
document_conflict_review.html  document_info.html            document_statement.html

[rjsparks]

richtext can go away again, yes?

[holloway]

Yep, done

[holloway]

@rjsparks Because we're changing the default formatting of <blockquote> to have a border-left I updated all the existing blockquotes to render without a border with those inline style="border-left: 0". Arguably those should just be <div>s for semantic reasons but I guess that can happen in another PR

[rjsparks]

Yes - some of those pages are crufty and may need to move out of the datatracker into another property or just go away.