docs: Add shim Sphinx config for readthedocs

This adds a faux Sphinx project under host/docs. When invoking sphinx,
it will in fact forward the generator request to Doxygen. This is useful
for generating the UHD manual, e.g., on readthedocs.

To enable the latter service, .readthedocs.yaml and environment.yml
files were added as well.

1 files changed, 7 insertions, 0 deletions

diff --git a/host/docs/sphinx/environment.yml b/host/docs/sphinx/environment.yml
new file mode 100644
index 000000000..16a5c10d5
--- /dev/null
+++ b/host/docs/sphinx/environment.yml
@@ -0,0 +1,7 @@
+name: UHD
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+  - cmake
+  - compilers