revise features (and move some sections to installation)

Author: davisagli

docs/mastering-plone/_static/frontpage_volto_logged_in.png

@@ -3,13 +3,13 @@ myst:
   html_meta:
     "description": "What to expect. Trainings on site. Training videos."
     "property=og:description": "What to expect. Trainings on site. Training videos."
-    "property=og:title": "About Mastering Plone development"
+    "property=og:title": "About Mastering Plone Development"
     "keywords": "Plone, training, develop"
 ---
 
 (about-mastering-label)=
 
-# About Mastering Plone development
+# About Mastering Plone Development
 
 The *Mastering Plone Development* training is both an online training and a handout for on-site trainings.  
 We address developers.

docs/mastering-plone/about_mastering.md

@@ -3,13 +3,13 @@ myst:
   html_meta:
     "description": "Our training story"
     "property=og:description": "Our training story"
-    "property=og:title": "The Case Study"
+    "property=og:title": "The case study"
     "keywords": "Plone, training"
 ---
 
 (case-label)=
 
-# The Case Study
+# The case study
 
 (case-background-label)=