Update introducing_templates.step

Fixed confusing things
Re-add missing image
Fix typos and add clarifications
Add missing code, and .html -> .phtml
Fix typos
Add public keyword
Merge pull request #33 from dshafik/phpbridge-changes

Numerous small fixes
Merge pull request #32 from MartinOlsansky/patch-2

Update introducing_templates.step
Add google analytics