Updated Makefile to force mkdocs to a fixed version.

This prevents numerous errors caused by significant changes in newer mkdocs versions.

Updated mkdocs/theme/base.html to use jquery-3.6.0.min.js as provided by mkdocs 1.5.3

Makefile

@@ -162,7 +162,7 @@ $(FAUSTDIR):
 
 ####################################################################
 install:
-	pip install mkdocs
+	pip install mkdocs==1.5.3
 	pip install markdown-include
 	pip install mkdocs-bootswatch
 	pip install python-markdown-math

mkdocs/theme/base.html

@@ -38,7 +38,7 @@
 
     {%- block libs %}
 
-    <script src="{{ 'js/jquery-1.10.2.min.js'|url }}" defer></script>
+    <script src="{{ 'js/jquery-3.6.0.min.js'|url }}" defer></script>
     <script src="{{ 'js/bootstrap.min.js'|url }}" defer></script>
     {%- if config.theme.highlightjs %}
     <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>