Change theme to get proper version swithcing support

README.md

@@ -14,6 +14,7 @@ sudo apt install python3-pip python3-sphinx texlive-full && pip3 install sphinx_
 
 You can see the options for building the documentation by running `make help`.
 
+
 ## Contributing
 
 To contribute to the Lubuntu Manual, you can either create a pull request on GitHub, or send patch mail to [lubuntu-devel@lists.ubuntu.com](mailto:lubuntu-devel@lists.ubuntu.com) and prefix the subject with `[Lubuntu Manual Pull Request]`.
@@ -21,3 +22,8 @@ To contribute to the Lubuntu Manual, you can either create a pull request on Git
 ## License
 
 This work is licensed under a Creative Commons Attribution 4.0 International License. More details can be found here: http://creativecommons.org/licenses/by/4.0/
+
+## Legacy Branch 
+This branch is for the LXDE version which means it only applies to 18.04 and earlier of which Support of 16.04 and 18.04 are last supported versions. 
+
+

source/conf.py

@@ -103,7 +103,7 @@ todo_include_todos = True
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'bootstrap'
+html_theme = 'sphinx_rtd_theme'
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the