Improve browsing of release notes and try.squeak.org integration

[LinqLover]

Warning

Breaking change: The old numbered text anchors like #opensmalltalk-vm-100 for ordered collection items are no longer available but have been replaced by unnumbered annchors like #opensmalltalk-vm. For most affected pages such as /community or /features, this does not really matter as these pages are effectively so short that the relevant item will appear immediately anyway. For /documentation and /downloads, this might be most noticable as these pages are longer. However, these anchors have been never stable anyway, because every addition of a newer book or version of Squeak in the past has changed the anchors anyway. Offering backwards compatibility seems pointless for this reason.

Depends on squeak-smalltalk/try.squeak.org#2.

Note: I'm mainly creating these PRs for structuring my changes, for running CI & Copilot reviews on them, and for transparency. I don't really need or are waiting for a review, even though feedback is always welcome :)

[Copilot]

Pull request overview

This PR improves on-site browsing of release notes and strengthens integration with try.squeak.org by modernizing anchor behavior (moving ids onto headings) and adding a dedicated release-note header with “Download” / “Try in browser” actions.

Changes:

• Replace legacy <span class="anchor"> anchors with element id anchors and a CSS scroll-margin-top offset.
• Add a release note header include + new release_note layout and set it as the default layout for the release_notes collection.
• Update the code: URL rewriter to generate try.squeak.org URLs with updated parameters and version-specific behavior.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
index.html	Moves section anchors onto headings for home page sections.
_sass/custom.scss	Replaces .anchor offset hack with scroll-margin-top and adds release-note header styling.
_release_notes/_note_head.html	Adds release note header content and try.squeak.org / downloads actions.
_plugins/code_links_rewriter.rb	Updates code: link rewriting to new try.squeak.org URL format and version-dependent behavior.
_layouts/section.html	Moves category anchors onto <h2> ids.
_layouts/release_note.html	New release-note layout that injects the release-note header above content.
_includes/item_with_img.html	Moves per-item anchors onto <h3> ids (image/icon items).
_includes/item_text_only.html	Moves per-item anchors onto <h3> ids (text-only items) and tweaks “Read on” link text.
_config.yml	Switches release notes default layout from default to release_note.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.