New docs are in mkdocs (#4178)

* start mkdocs

* simple docs for tensor

* more docs

* move those back

* more docs

* copy markdown extensions

* docs legacy

* docs building workflow

* fix showcase links

* only that?

* install tinygrad

* add docs to setup.py

* Delete examples/llm.c/data

.pre-commit-config.yaml

@@ -21,7 +21,7 @@ repos:
         pass_filenames: false
       - id: docs2
         name: docs2
-        entry: python3 docs/abstractions2.py
+        entry: python3 docs-legacy/abstractions2.py
         language: system
         always_run: true
         pass_filenames: false