fix doc build on readthedocs

Author: dbu

.readthedocs.yaml

@@ -1,12 +1,13 @@
 version: 2
 
+build:
+    os: ubuntu-lts-latest
+    tools:
+        python: "3.11"
+
 sphinx:
     configuration: conf.py
 
-# additional formats
-formats:
-    - pdf
-
 python:
-    version: "3.7"
-
+    install:
+        - requirements: requirements.txt

_exts/phpcr/__init__.py

@@ -1,16 +1,15 @@
-div.header {.
+div.header {
      margin: 0;
-     background: #191818;
-     background-image: none;
-     color: #333;
+    background: #191818 none;
+    color: #333;
      text-align: left;
      padding: 10px 10px 10px 10px;
      border-bottom: 1px solid #eee;
  }
 
 div.logo {
     text-align: left;
-    padding-top: 0px;
+    padding-top: 0;
 }
 
 div.header a {