Update readthedocs.ymlwith latest requirements

Author: rhpvorderman

.readthedocs.yml

@@ -1,15 +1,22 @@
 version: 2
 formats: []  # Do not build epub and pdf
 
-# This adds mambaforge for the installation
-build:
-  os: "ubuntu-20.04"
-  tools:
-    python: "mambaforge-4.10"
-
 python:
   install:
-    - method: pip
-      path: .
-conda:
-  environment: docs/conda-environment.yml
+    - requirements: "requirements-docs.txt"
+    - method: "pip"
+      path: "."
+
+sphinx:
+  configuration: docs/conf.py
+
+build:
+  os: "ubuntu-22.04"
+  tools:
+    python: "3"
+  apt_packages:
+    - python3
+    - python3-pip
+    - cmake
+    - git
+    - googletest