Fix ReadTheDocs YAML configuration

Author: yifanmai

.readthedocs.yaml

@@ -1,6 +1,14 @@
 version: 2
 mkdocs:
-    configuration: mkdocs.yml
+  configuration: mkdocs.yml
+
+build:
+  os: "ubuntu-20.04"
+  tools:
+    python: "3.8"
+
 python:
-    install:
-    - requirements: docs/requirements.txt
+  install:
+  - requirements: docs/requirements.txt
+  - method: pip
+    path: .

mkdocs.yml

@@ -1,22 +1,22 @@
 site_name: CRFM HELM
 repo_url: https://github.com/example/repository/
 theme:
-    name: readthedocs
-    highlightjs: false
+  name: readthedocs
+  highlightjs: false
 plugins:
-    - search
-    - macros:
-        module_name: docs/mkdocs_macros
-    - mkdocstrings:
-        handlers:
-            python:
-                show_root_heading: true
-                show_signature_annotations: true
-                show_bases: false
-                show_source: false
+  - search
+  - macros:
+      module_name: docs/mkdocs_macros
+  - mkdocstrings:
+      handlers:
+        python:
+          show_root_heading: true
+          show_signature_annotations: true
+          show_bases: false
+          show_source: false
 extra_css:
-    - docstrings.css
+  - docstrings.css
 markdown_extensions:
-    - pymdownx.magiclink
+  - pymdownx.magiclink
 watch:
-    - src
+  - src