Add initial ADRs

docs/architecture-decisions/001-tome.txt

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+Migrate to Tome
+
+Date: 2025-05-03
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+Status: accepted
+
+Context:
+
+The previous version of the website is built with Sculpin, a static site generator written in PHP.
+
+Whilst it's a great project, I've felt that I've started to outgrow it in some ways and have been thinking about migrating to something else.
+
+I've been aware of Tome - https://www.drupal.org/project/tome - for a while and it seems like a logical choice for someone who likes both Drupal and static site generators.
+
+Decision:
+
+Migrate pages from Sculpin to Drupal/Tome.
+
+This can be done incrementally and different pages can be served from Sculpin or Tome based on the URL being visited.
+
+Consequences:
+
+I can continue to work with familiar tools - e.g. PHP, Drupal, PHPUnit - and don't need to migrate to (or back to) something different like Jekyll, Hugo or Astro.
+
+Tome will allow me to export the content from Drupal to a static website, the same as Sculpin does, so I'll continue to get the same benefits of a static website, such as performance, security and being easy to host and deploy.
+
+For consistency, a new theme would need to be created in Drupal so users aren't confused when being served pages from different sources. A lot of the same markup and CSS should be able to be reused.
+
+As new pages and sections are rebuilt in Drupal/Tome, I can serve these to users by updating the rules in Nginx and incrementally migrate rather than rebuilding and deploying everything at once - making it less risky.
+