update issues

content/README.md

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+# treehouse content
+
+The treehouse is built on its own custom data format called `.tree`.
+
+I'll spare the explanation, because it's an _extremely_ simplistic format, but know that it nests:
+
+- TOML metadata
+- Djot markup
+
+inside of itself.
+
+TOML metadata is defined by `Attributes` from the `treehouse` crate. 
+
+Djot on the other hand has support for generic attributes.
+Keys are not documented (read the generator if you want to know about them,) but generally `:`-prefixed keys are
+reserved for the treehouse's own purposes.
+
+You probably don't want to read the content if you're not me.
+Browse the treehouse yourself, experience it fully, and then when you're _sure_ you don't want to get spoiled, come back
+here and look for weird stuff.