standardise block colour scheme

[jim-smith]

• Blue (<div class="alert alert-block alert-info" style="color:black">)Activity descriptor

• Green: (<div class="alert alert-block alert-success" style="color:black">)'how to get started" and "hints" boxes below activity descriptor

• Beige (<div class="alert alert-block alert-warning" style="color:black">) : Generic e.g. description of general comp sci/ programming issues

• separate each section with a black line: <div style="background-color:black;width:100%;">.</div>

• [x] week 1

• [x] week 2

• [x] week 3

• [x] week 4

• [ ] week 5

• [ ] week 6

• [ ] week 7

• [ ] week 8

• [ ] week 9

• [ ] week 10

• [ ] week 11

[NathanDuran]

Also adding <div class="alert alert-block alert-danger" style="color:black"> For marked workbooks

[jim-smith]

merge approved for weeks 1-4 but there are conflicts with the smog test that need resolving