[WIP] Add recently added and updated lists to index page

[Copilot]

• Understand the repository structure and build process
• Identify the issue: Recently added/updated sections were being placed in the wrong location
• Fix build_index.py to inject the sections between <!-- recently starts --> and <!-- recently stops --> comments instead of before the "Image and media" heading
• Add clickable date links that point to the colophon page with anchors (e.g., https://tools.simonwillison.net/colophon#rtf-to-html.html)
• Test the fix locally and verify the output

Changes Made

Modified build_index.py to:

1. Inject the "Recently added" and "Recently updated" sections between the <!-- recently starts --> and <!-- recently stops --> comment markers in the README.md
2. Make dates clickable links that point to the corresponding entry in the colophon page (e.g., clicking "17th October 2025" for rtf-to-html takes you to https://tools.simonwillison.net/colophon#rtf-to-html.html)

Screenshot

The recently sections now appear in the correct location with clickable dates:

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Recently added and recently updated on index page</issue_title>
<issue_description>It's a bit stale right now, the interesting stuff is all on /colophon.</issue_description>

Comments on the Issue (you are @copilot in this section)

@simonw Codex Cloud prompt:

Add "Recently added" and "Recently updated" lists to the generated index.html page, as two columns next to each other, each listing 5 files (listed just as the stub filename e.g. svg-render plus the date they were added or updated as "4th October 2025" style). Figure out recently added first and only show things in Recently updated if they were not already shown in Recently added. Make sure the build.sh script and the github actions scripts both do whatever is needed to update that information. Put these two columns together above the Image and media heading.

@simonw OK, it now looks like this:

That's not quite right. I want these two columns to appear where I just added these comments to the README.md:

<!-- recently starts -->
<!-- recently stops -->

Also they all seem to be showing the same date. That's wrong, they should be showing the date of either the first commit that touched them or the most recent commit that edited them, depending on which column they are in.</comment_new>

Fixes #62

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[cloudflare-workers-and-pages]

Deploying tools with    Cloudflare Pages

Latest commit:	1189ad8
Status:	✅  Deploy successful!
Preview URL:	https://42c36a8e.tools-b1q.pages.dev
Branch Preview URL:	https://copilot-add-recently-lists-i.tools-b1q.pages.dev

View logs

[simonw]

I sent this to Copilot while it was working:

The dates in those two columns should link to https://tools.simonwillison.net/colophon#rtf-to-html.html or similar so that the user can click the date to see what was added/changed

[simonw]

Screenshot looks great. The Cloudflare preview still shows the wrong date, presumably it's only doing a shallow checkout.