Fix heading-order accessibility: set card heading levels and remove FAQ placeholder headings

Problem/Motivation

An axe-core accessibility audit of the Educare site template found a moderate WCAG 2.4.6 (Headings and Labels) heading-order violation repeated across the template: heading levels skip (e.g. a section <h2> followed directly by a card <h5>, or an <h1>→<h2>→<h5> gap). It was found on the homepage, /programs, a program page, a news article, /events, an event page and /about.

On the recipe/content side, two root causes: card and heading titles across several Canvas patterns (three-action cards, the event last-row cards, stories, and the footer) were hardcoded to a heading level chosen for visual size rather than for document outline (h5/h6, and h4 on the footer); and the FAQ accordion pattern shipped 24 placeholder headings reading "Your heading goes here", none of which had a level appropriate to their position. See also the related theme issue #3614488, which fixes the same audit finding on the Share component.

Steps to reproduce

1. Install the Educare site template on a fresh site.
2. Run an axe-core heading-order check (e.g. the Varbase functional testing suite's a11y step, or axe DevTools) on the homepage, /programs, a program page, a news article, /events, an event page and /about.
3. Observe heading-order violations: card/heading titles skip levels, the footer heading skips from h1/h2 to h4, and the FAQ accordion's 24 placeholder headings break the outline.

Proposed resolution

Decouple the heading LEVEL from the visual SIZE, keeping visual size via a text-size class:

• Card/heading titles in canvas.pattern.threeactionscard.yml, canvas.pattern.eventlastrow.yml and canvas.pattern.stories.yml: heading level h5/h6 → h3, size kept via a text-size class.
• canvas.page_region.vartheme_bs5_educare.footer.yml: footer heading level 4 → 2, with a text_size: h4 class so it still looks the same.
• The /events "Upcoming Events" heading: level 3 → 2, with a text_size: h3 class.
• canvas.pattern.faq.yml and the affected content/canvas_page/*.yml entries: removed the 24 placeholder "Your heading goes here" FAQ headings.
• recipe.yml updated to match.

Verified: axe heading-order is 0 across the 7 affected pages on a fresh install; card/heading visual sizes are unchanged; gitlab-ci-local is green on this repo.

Remaining tasks

• ✅ File an issue about this project
• ❌ Addition/Change/Update/Fix to this project
• ❌ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ➖ Developer Documentation support on feature change/addition
• ➖ User Guide Documentation support on feature change/addition
• ➖ UX/UI designer responsibilities
• ❌ Accessibility and Readability
• ❌ Reviewed by a human
• ❌ Code review by maintainers
• ❌ Full testing and approval
• ❌ Credit contributors
• ❌ Review with the product owner
• ❌ Update Release Notes
• ❌ Release

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• Fixed heading-order accessibility issues by correcting card/heading levels and removing FAQ placeholder headings.