Update blog layout

- only one column for entries
- back link added to the bottom of an entry
- remove unnecessary HTML elements
Add style for warning box in docs
Added XML sitemap module. Updated manual module to use a new custom route type so its URLs will work in the XML sitemap
Removed a couple of code references which are no longer used
Add ZF2A course banner to downloads, manual sidebars
Merge branch 'hotfix/zf2a-banner'
Make hero image on homepage smaller
Merge branch 'hotfix/homepage-banner'
Merge pull request #100 from froschdesign/hotfix/blog

Update blog layout
[#100] Added missing echo

- Without it, the list was not being rendered!
[#100] re-compiled blog

- so that layout changes take effect
Merge branch 'hotfix/100'

Close #100
Merge pull request #102 from froschdesign/hotfix/docs-warning-box

Add style for warning box in docs

Conflicts:
	public/css/app.min.css
Merge branch 'hotfix/102'

Close #102
Merge pull request #105 from tfountain/xmlsitemap

XML sitemap for manual

Conflicts:
	module/Manual/src/Manual/Controller/PageController.php
Merge branch 'hotfix/105'

Close #105
Replaced ZF2A course banner with new image

- to remove expiry
Merge branch 'hotfix/course-promo'
Update promo image on manual, downloads sidebars
Merge branch 'hotfix/course-promo'