Set up RLax sphinx documentation for readthedocs to build and serve d…

…ocumentation from the public github.

PiperOrigin-RevId: 412441791

.readthedocs.yaml

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+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+version: 2
+
+sphinx:
+  builder: html
+  configuration: docs/conf.py
+  fail_on_warning: false
+
+python:
+  version: 3.7
+  install:
+    - requirements: requirements/requirements-docs.txt
+    - requirements: requirements/requirements.txt
+    - method: setuptools
+      path: .

docs/.gitignore

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+_build

docs/Makefile

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+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+SOURCEDIR     = .
+BUILDDIR      = _build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.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 $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)