updates to the RTD configuration (#102)

* remove `importlib-metadata` from the docs build deps

* hook into RTD's build system

* fix the path to `conf.py` [skip-ci]

Author: keewis

.readthedocs.yaml

@@ -6,6 +6,11 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3.10"
+  jobs:
+    post_checkout:
+      - (git --no-pager log --pretty="tformat:%s" -1 | grep -vqF "[skip-rtd]") || exit 183
+    pre_install:
+      - git update-index --assume-unchanged docs/conf.py
 
 python:
   install:

docs/requirements.txt

@@ -1,4 +1,3 @@
-importlib-metadata; python_version < "3.8"
 packaging
 sphinx>=3.1
 sphinx_rtd_theme