add article: flake template

content/2023-11-07-flake-template.md

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+Title: A Nix Flake Template
+Author: Paul-Nicolas Madelaine
+Date: 2023-11-07
+Category: Blog
+Summary: I wrote a Flake template
+
+I learned to use Nix when flakes were already ubiquitous, and I realized
+recently that by learning Nix through flakes I adopted some bad coding habits. I
+don't think I am the only one that tends to overload their `flake.nix` (the
+flake of [Nix](http://github.com/nixos/nix/blob/master/flake.nix) is over 700
+lines long at the time of writing). Paradoxically, this makes flake expressions
+less discoverable, or at least less flexible. For instance, how do you override
+the package expression defined in a `flake.nix` to try and build it for a system
+that is not explicitly exposed by this flake? In many cases, you can't! Just
+fork the repository and patch the Nix code!
+
+A friend recently told me about [Niv](https://github.com/nmattia/niv), and I
+really liked the way I naturally set up my projects when trying it out, namely
+in a more modular fashion than before. Even if I decided to stick with flakes, I will
+be trying to write them in a more modular way going forward.
+
+If you are interested, I wrote a
+[template](https://github.com/pnmadelaine/flake) that I will be using for medium
+to large projects in the future (it may be a bit ridiculous for smaller flakes).
+For a non-trivial example, you can take a look at
+[Typhon](https://github.com/typhon-ci/typhon) (more on that soon, hopefully!).