add tag page describing all tags

currently unreachable but curious cats should be able to find it pretty easily

content/tag.dj

@@ -0,0 +1,31 @@
+title = "Tags"
+
++++
+
+Each post on this website has an associated set of _tags_.
+
+Tags describe categories a post belongs to.
+They can be used to filter out posts, by clicking on a specific tag in the feed, or accessing `/tag/{name}` (e.g. [`/tag/all`][page:tag/all]).
+
+There is a small, carefully chosen set of tags.
+I introduce new tags parsimoniously, when there are enough posts to warrant a round of grouping by [semantic compression](https://caseymuratori.com/blog_0015).
+This is to reduce the amount of tags that end up having only have one post.
+
+Below is a list of all the tags currently in existence.
+
+- [`#all`][page:tag/all] - all public posts
+- [`#meow`][page:tag/meow] - posts about myself
+- [`#programming`][page:tag/programming]
+
+    - [`#graphics`][page:tag/graphics] - graphics programming
+    - [`#plt`][page:tag/plt] - programming language theory and design
+    - [`#c`][page:tag/c]
+    - [`#cxx`][page:tag/cxx] - C++
+    - [`#lua`][page:tag/lua]
+    - [`#javascript`][page:tag/javascript]
+
+- [`#design`][page:tag/design]
+- [`#music`][page:tag/music]
+- [`#games`][page:tag/games]
+- [`#shower`][page:tag/shower] - shower thoughts
+- [`#treehouse`][page:tag/treehouse] - meta updates about the website