Sphinx docs generation (#22697)

* add sphinx

* switch theme

* Experiment: sphinx docs generation updated (#22708)

* moved build to root gitignore, added .gitkeep

* Improved makefile doc build process

- Removed auto-generated docs from source control
- Moved apidoc.sh into Makefile
- Removed make.bat (can add back if Windows support desired)
- Added sphinx viewcode and markdown extensions
- Added feature to source /docs in build, so any .rst file in /docs will
  override the respective file during the build process
- Added feature to copy all markdown/rst files from source into /build/
  during build process so they can be easily referenced while writing
  docs (see examples in index.md)
- Wrote basic starter index.md file

TODO: Add new dependencies to Pipfile [dev-packages]

* Revert accidental modification to Pipfile

* fix command substitution

* exclude xx

* improve docs

* dont include all docs in release build

* Add dockerfile

* update title

* include normal readme

* build container in CI

* use buildkit

* add login

Co-authored-by: Chad Bailey <chadbailey904@gmail.com>
old-commit-hash: b816b5b6442c21e63a09108c70986eeedb0372b2

docs/Makefile

@@ -0,0 +1,53 @@
+# Minimal makefile for Sphinx documentation
+#
+
+OPENPILOT_ROOT = `git rev-parse --show-toplevel`
+
+# You can set these variables from the command line, and also
+# from the environment for the first two.
+SPHINXOPTS    ?=
+SPHINXBUILD   ?= sphinx-build
+DOCSDIR       = "$(OPENPILOT_ROOT)/docs"
+SOURCEDIR     = "$(OPENPILOT_ROOT)/build/docs"
+DOCSBUILDDIR  = "$(OPENPILOT_ROOT)/build/docs"
+BUILDDIR      = "$(OPENPILOT_ROOT)/build"
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(DOCSBUILDDIR)" $(SPHINXOPTS) $(O)
+
+clean:
+	@echo "Cleaning build folder..."
+	rm -rf "$(BUILDDIR)"
+
+.PHONY: help Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	@echo "Cleaning build folder..."
+	rm -rf "$(BUILDDIR)"
+	mkdir -p "$(DOCSBUILDDIR)"
+
+	@echo "Copying docs & config to build folder..."
+	cp -a "$(DOCSDIR)" "$(BUILDDIR)"
+	cd "$(OPENPILOT_ROOT)" && \
+		find . -type f \( -name "*.md" -o -name "*.rst" \) \
+			-not -path "*/.*" \
+			-not -path "./build/*" \
+			-not -path "./docs/*" \
+			-not -path "./xx/*" \
+			-exec cp --parents "{}" ./build/docs/ \;
+
+	@echo "Building rst files..."
+	sphinx-apidoc -o "$(DOCSBUILDDIR)" ../ \
+		../xx ../laika_repo ../rednose_repo ../pyextra ../notebooks ../panda_jungle \
+		../third_party \
+		../panda/examples \
+		../scripts \
+		../selfdrive/modeld \
+		../selfdrive/debug \
+		$(shell find .. -type d -name "*test*")
+
+	@echo "Building html files..."
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(DOCSBUILDDIR)" $(SPHINXOPTS) $(O)