Finally add the nikola -> hugo TODO list

TODO.org

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+#+TITLE: Todo
+
+* TODO Move over to Hugo
+
+- [X] Content updated just enough so that site builds
+- [X] Legacy content still in place
+- [-] Fix Nikola-specific stuff
+  + [X] Replace/update shortcodes
+  + [ ] ~!!!~ admonitions
+  + [ ] Auto-generated talks page
+- [X] Fix metadata in .org format posts
+- [X] Blog post URLs unchanged
+- [X] Tag/etc. index pages work with same URLs
+- [X] Redirects in place for RSS feed
+
+* TODO Implement new theme
+
+- [X] Update theme README
+- [ ] Style definition lists (e.g. [[https://erambler.co.uk/blog/uhk-first-thoughts/][Ultimate Hacking Keyboard: first thoughts]])
+- [ ] Add some default colours and titles for admonition types
+  + commentary
+  + aside
+  + tldr
+  + intro
+  + prerequisites
+- [X] Try adding cactus.chat comments?
+- [X] Get SCSS building
+- [X] Simple single-column layout (no fonts/colours)
+- [X] Add custom fonts (Iosevka family)
+- [X] Add a little bit of colour
+- [X] Syntax highlighting
+- [X] Social links in place
+- [X] Render extra post types:
+  + [X] Render ~type: link~
+  + [X] Render ~type: note~
+- [X] Site navigation functional
+- [X] Article TOCs shown for ~showTOC: true~
+- [X] Linkify topics in homepage description
+- [X] Fix vanishing margin on taxonomy pages
+- [X] Reimplement series
+- [X] Re-add webmention comments
+- [X] Set correct ~<link>~ value for link item types in RSS feed
+- [X] Put full content into RSS feed
+- [X] Refactor repeated structural elements from templates