Tweaks to preparation notes

Author: tomclose

_sessions/c1prep/0_welcome.md

@@ -17,7 +17,7 @@ That does mean that there's a bit of setting up that you will need to do to be r
 The tabs on the left hand side will take you through installing the software you'll need for the course. Instructions are given in blue boxes.
 
 {% exercise %}
-The blue boxes tell you what you need to do. Read them carefully!
+The blue boxes tell you what you need to do!
 {% endexercise %}
 
-If you have any problems, please email your course instructor!
+If you have any problems, please contact the tech team!

_sessions/c1prep/3_github_account.md

@@ -1,5 +1,5 @@
 ---
-title: GitHub
+title: GitHub account
 ---
 
 Git is a program that helps with the management of code. It means that you completely avoid the situation where you end up with files called `team_contacts_v1`, `team_contacts_v2` etc. It also allows you to share your code with others and collaborate on code in an efficient way.