Logo to take you to home page

You simply did not close the A-Element. To prevent this write no own HTML code, it's for experts only.

Create an unpublished page named f.e. "Page wide articles".
Create a module type "HTML".
Fill in

HTML Code:

 {{insert_article::logo}} (or "header") 

Include this module in your layout(s).
Inside the article "logo" create whatever you want. A CE type image that links to your homepage, or a CE type hyperlink with an image that links to your homepage.
For the link use the inserttag {{env::host}}.

There's an old german wiki topic by me, it's alike what I told you here. http://de.contaowiki.org/Diskussion:...der_und_Footer