Multiple links in demo page all link to walkthough page.

The start pages, which are accessible through http://localhost:8080 when the demo has been started are outdated, and should be updated and fixed for 7.7.

At least the following issues should be addressed (there could be more inconsistencies):
(1) The start page should not have the following links, because they don't work:

• Hippo Template Composer
• Hippo Go Green preview website
• Hippo Go Green Mobile Preview website
  (2) The start page states some wrong versions of browsers, and Chrome is supported.
  (3) Walkthrough: A link to "Preview Mode", that doesn't work.
  (4) Walkthrough: Typo: bfor (should be 'for'), and at the end 'theonline'. Run a spell check.
  (5) Walkthrough: Most images are outdated. Probably some descriptions too.
  (6) Walkthrough: Left-side menu: incorrect links to: preview
  (7) Confusing in the demo start pages: "Basics Tutorial", "Features" and "Hippo CMS Walkthrough" all link to the Walkthrough. Be consistent.