Introduce nix flake

README.md

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+# tlaternet-templates
+
+Website templates bundled with parcel.
+
+## Updating
+
+Firstly, updating the npm dependencies needs:
+
+```sh
+npm update --package-lock-only
+```
+
+After that, the NixOS derivations can be updated by running
+`generate.sh` in the `nix` subdirectory.
+
+### Note
+
+[Sharp](https://github.com/lovell/sharp/releases) is gloriously hard
+to install, because it depends on the most cutting-edge patch version
+of `vips`.
+
+Check which version it needs in the `package.json` of sharp, and then
+match this up which major sharp version matches up to which OS version
+of vips.
+
+Known versions:
+
+| Sharp | vips       | NixOS |
+| ----: | ---------: | ----: |
+| 28.*  | 8.10.6     |       |
+| 27.*  | 8.10.5     | 21.05 |
+| 26.*  | 8.10.0     | 20.09 |