Adding quick-fixes for typo/wording improvements for the Getting Started...

... Guide for @leggeter to review

#7 (View the code js file path reference correction)
#9/#10 - Updating all getting-started screenshots which had the 'Messages' widget on workbench pages on the left as these have been removed from the template
#11 Fixing typo for first para of Add Two-Way Data Binding
#12 Fixing function reference 'enterPressed' -> 'keyPressed'
#13 Changing 'to see if it's the *Enter/Return*' -> 'to see if it was the *Enter/Return* key'
#14 This was resolved when the 'Run the Test' section was reworked after adding --no-browser flag support
#28 Typo fix: 'updated it to look as follows' -> 'update it to look as follows'