Fix WCAG 1.4.4 — use relative font-size on html root to respect browser font preferences

[varadekd]

• Issue: https://github.com/DOAJ/doajPM/issues/4147

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Fix WCAG 1.4.4 — use relative font-size on html root to respect browser font preferences

Replaces hardcoded px font-size values on the html root and three component-scoped overrides (.search-results, .dashboard, .at-twenty) with
relative units. Users on the default 16px browser setting see no visual change (125% × 16px = 20px). Users who have set a larger font size in
their browser preferences will now have that preference respected, as required by WCAG 2.2 AA criterion 1.4.4 (Resize Text).

Files changed

• cms/sass/base/_general.scss — 20px → 125%, 18px → 112.5% (mobile)
• cms/sass/components/_search-results.scss — 20px → 1rem, 18px → 0.9rem
• cms/sass/themes/_dashboard.scss — 18px → 0.9rem
• cms/sass/themes/_timeline.scss — 20px → 1rem

This PR...

• has scripts to run
• has migrations to run
• adds new infrastructure
• changes the CI pipeline
• affects the public site
• affects the editorial area
• affects the publisher area
• affects the monitoring

Developer Checklist

Developers should review and confirm each of these items before requesting review

• Code meets acceptance criteria from issue
• Unit tests are written and all pass
• User Test Scripts (if required) are written and have been run through
• Project's coding standards are met
  • No deprecated methods are used
  • No magic strings/numbers - all strings are in constants or messages files
  • ES queries are wrapped in a Query object rather than inlined in the code
  • Where possible our common library functions have been used (e.g. dates manipulated via dates)
  • Cleaned up commented out code, etc
  • Urls are constructed with url_for not hard-coded
• Code documentation and related non-code documentation has all been updated
  • Core model documentation has been added to if needed: https://docs.google.com/spreadsheets/d/1lun2S9vwGbyfy3WjIjgXBm05D-3wWDZ4bp8xiIYfImM/edit
  • Events and consumers documentation has been added if needed: https://docs.google.com/spreadsheets/d/1oIeG5vg-blm2MZCE-7YhwulUlSz6TOUeY8jAftdP9JE/edit
• Migation has been created and tested
• There is a recent merge from develop

Reviewer Checklist

Reviewers should review and confirm each of these items before approval
If there are multiple reviewers, this section should be duplicated for each reviewer

• Code meets acceptance criteria from issue
• Unit tests are written and all pass
• User Test Scripts (if required) are written and have been run through
• Project's coding standards are met
  • No deprecated methods are used
  • No magic strings/numbers - all strings are in constants or messages files
  • ES queries are wrapped in a Query object rather than inlined in the code
  • Where possible our common library functions have been used (e.g. dates manipulated via dates)
  • Cleaned up commented out code, etc
  • Urls are constructed with url_for not hard-coded
• Code documentation and related non-code documentation has all been updated
  • Core model documentation has been added to if needed: https://docs.google.com/spreadsheets/d/1lun2S9vwGbyfy3WjIjgXBm05D-3wWDZ4bp8xiIYfImM/edit
  • Events and consumers documentation has been added if needed: https://docs.google.com/spreadsheets/d/1oIeG5vg-blm2MZCE-7YhwulUlSz6TOUeY8jAftdP9JE/edit
• Migation has been created and tested
• There is a recent merge from develop

Testing

List user test scripts that need to be run

List any non-unit test scripts that need to be run by reviewers

Deployment

What deployment considerations are there? (delete any sections you don't need)

Configuration changes

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Scripts

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Migrations

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Monitoring

What additional monitoring is required of the application as a result of this feature

New Infrastructure

What new infrastructure does this PR require (e.g. new services that need to run on the back-end).

Continuous Integration

What CI changes are required for this