Add minutes pages to Jekyll build process, based on meeting-minutes service

[kfranqueiro]

This adds statically-generated minutes pages, with the following goals:

• to enable ultimately removing the current minutes pages' reliance on MySQL
• to better integrate into the WAI website, especially with regard to navigation templates

Keep in mind that this means that minutes index pages will only be updated when we publish new builds.

Of particular note:

• Resolutions pages now group by meeting, just like the topics pages, but meetings with no resolutions are skipped, because that occurs more often than not
• I attempted to make titles more consistent across all of the groups/TFs' minutes pages
  • Consistently included and abbreviated WG / TF
  • Abbreviated particularly long names with common abbreviations to avoid extremely long headings
    • Reasoning: any expansion should already have been established by wherever the visitor arrived from
  • Distinguished Minutes / Topics / Resolutions in page title and h1; not in navigation/breadcrumb, since all 3 are strongly correlated (and used to effectively be one endpoint) - see Add navigation entries for minutes pages wai-website-data#195 for the navigation.yml changes
• MATF minutes page has been updated to include both channels' minutes, and the Communications section of the TF's page has been updated accordingly to only link to the minutes listing page
• PDF-AAM was not being properly indexed before; this is now fixed
• The JSON data used to organize channels into groups is stored directly in this repo, as there should not be any reason any other repo would need to access it, and it directly relates to the Jekyll plugin also in this PR
• The Jekyll plugin will request from the meeting-minutes service at build time; it may take several seconds the first time, but subsequent requests should complete in under 2 seconds

Pages covered in this PR

(note this excludes a number of channels we used to have pages for, e.g. all of the Silver groups for WCAG 3)

Existing WAI/... URL	New WAI/... URL
GL/minutes-history	about/groups/agwg/minutes
GL/task-forces/coga/minutes	about/groups/task-forces/coga/minutes
GL/task-forces/conformance-testing/minutes	about/groups/task-forces/conformance-testing/minutes
GL/task-forces/low-vision-a11y-tf/minutes	about/groups/task-forces/low-vision-a11y-tf/minutes
GL/task-forces/matf/minutes	about/groups/task-forces/matf/minutes
GL/task-forces/wcag2ict/minutes	about/groups/task-forces/wcag2ict/minutes
APA/minutes	about/groups/apawg/minutes
APA/task-forces/adapt/minutes	about/groups/task-forces/adapt/minutes
APA/task-forces/fast/minutes	about/groups/task-forces/fast/minutes
APA/task-forces/maturity-model/minutes	about/groups/task-forces/maturity-model/minutes
APA/task-forces/pronunciation/minutes	about/groups/task-forces/spoken-presentation/minutes
APA/task-forces/research-questions/minutes	about/groups/task-forces/research-questions/minutes
ARIA/minutes	about/groups/ariawg/minutes
ARIA/task-forces/practices/minutes	about/groups/task-forces/practices/minutes
ARIA/task-forces/pdf-aam/minutes	about/groups/task-forces/pdf-aam/minutes

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