Write changelog

book/src/changelog.md

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 # Changelog
 
+## 0.4.0
+
+After what must have felt like ages for everyone, we finally have a new release
+of Polylux! 🥳
+
+Version 0.4.0 is now fit for Typst 0.12.0 and has become more streamlined.
+From now on, we rely on the Typst support for templates and the package does not
+ship builtin themes anymore.
+In the meantime, other packages for building slides in Typst have gained
+traction and it is a natural question why you should still use Polylux.
+Well, that I don't know.
+But _I_ still use Polylux because I like a "non hacky" way of using Typst.
+Polylux has now taken on the policy that features are preferrably not
+implemented rather than implemented in hacky way, potentially relying on brittle
+internals of Typst and such.
+There is of course no rigorous definition for that so in the end it comes down
+to what I consider acceptable for myself.
+At the same time, I hope that other might share this view and can enjoy this new
+version of Polylux.
+
+Some notable changes, besides the removal of themes:
+- The dreaded `#pause` was removed in favour of `#show: later`.
+- There is a new `toolbox` module exported by Polylux that contains many helpful
+  elements for designing your own slides (some of them have previously been
+  available in the now removed `utils` module).
+- The book has been improved both in content and visuals.
+- By changing the internal infrastructure for creating example previews,
+  Polylux is finally considered a Typst repo by GitHub :D
+- The Polylux repository now resides in a custom polylux-typ GitHub
+  organisation.
+- Polylux has a new logo.
+  It's more elegant than the previous one although I know that some liked the
+  silliness of the googly eyes...
+
+I recommend going through the book and finding out how Polylux works now!
+
 ## v0.3.0
 
 - The previously existing module `helpers` was transformed to `utils` and now