update course learning goals

docs/index.md

@@ -4,9 +4,10 @@
 
     After following this course you will be able to:
 
-    - Formulate the main models of solid state physics
-    - Given a description of a solid state physics problem, write down the corresponding equations
-    - Identify the relevant approximations and apply them to solve this problem
+    - Model collective properties of fermions and bosons using density of states
+    - Determine and analyse band structures of simple models of solid state systems
+    - Describe and analyse properties of crystals
+    - Analyse properties of semiconductor devices
 
 In these notes our aim is to provide learning materials which are: