Update .readthedocs.yaml to install sphinx_rtd_theme

Signed-off-by: Arthur She <arthur.she@linaro.org>
Change-Id: Id9de494a90a4616a9b42d210513d7cc278943647
1 file changed
tree: 2144be5736aa40236c94f26825df012d6aee4b38
  1. docs/
  2. .gitignore
  3. .readthedocs.yaml
  4. test.txt