enable workshop printing

workshop/content/docs/index.md

@@ -94,6 +94,10 @@ This workshop is always provided live at [https://dive.pygeoapi.io](https://dive
 
 The workshop contents, wiki and issue tracker are managed on GitHub at [https://github.com/geopython/diving-into-pygeoapi](https://github.com/geopython/diving-into-pygeoapi).
 
+## Printing this workshop
+
+To print this workshop, navigate to the [print page](print_page) and select *File > Print > Save as PDF*.
+
 # Support
 
 A [Gitter](https://app.gitter.im/#/room/#geopython_diving-into-pygeoapi:gitter.im) channel exists for

workshop/content/mkdocs.yml

@@ -48,6 +48,7 @@ theme:
 
 plugins:
     - search
+    - print-site
 
 markdown_extensions:
     - meta # option to add some meta tags on top, title, author, date, etc

workshop/content/requirements.txt

@@ -1,2 +1,3 @@
 mkdocs
-mkdocs-material
+mkdocs-material
+mkdocs-print-site-plugin