[#150] Mouse graphic isn’t used, so removing.

Also updating screenshot to present a more accurate representation of
Herbert’s true self.
Project sections and order changed
Ghostbusters resources added
Merge pull request #151 from andylolz/150-herbert

[#150] Mouse graphic isn’t used, so removing.
Added some {.new-page} tags in readiness for auto PDF rendering
Paint Box: fixed Scratch blocks in Step 4
Scratch cards moved from 'Frantic Felix' to 'Sound Machine' project
Replace badly titled PDFs
[#156] Add missing mp3; rename Images folder
Update 04 Fruit Machine.md

Fixed an incorrectly marked down green block when explaining how to use
the 'and' operator.
Clarified from where the sprite should be added.
Corrected number of steps taken by parrot when boosting.
Merge branch 'IanDominey-master'
Merge pull request #159 from andylolz/156-missing-mp3

[#156] Add missing mp3; rename Images folder
Added Code Club Scratchcards to the download materials for projects that reference them
[#163] Fix various 404s flagged by linkchecker

Add some missing files; fix some case-related issues
Merge pull request #164 from andylolz/163-fix-404s

[#163] Fix various 404s flagged by linkchecker
Fix scratch blocks in polish Paint Box
Fix formatting error in defining a scratch block

I suspect this relates to the version of pandoc used. The version I’m
running (1.12.4) does not attempt to lowercase classes, so it’s
necessary to specify the language as either `scratch` or `blocks` in
lowercase.
Merge pull request #166 from andylolz/sv-format-err

Fix formatting error in defining a scratch block