Fix 404s to html asset pages

[alflennik]

Fixes issue https://github.com/w3c/wai-aria-practices/issues/186.

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[howard-e]

@alflennik thanks for addressing that so quickly. Ran through the list directly and also getting to them from the application as well and it looks good for the most part but still 2 concerns here:

• /patterns/feed/examples/feeddisplay
  • The ratings icons are broken here
• /patterns/landmarks/examples/index
  • Still 404s, but is this still a valid URL? I don't see a corresponding .html for this coming from aria-practices

[howard-e]

• /patterns/feed/examples/feeddisplay

  • The ratings icons are broken here

@alflennik I see your comment on now so this can be ignored.

[alflennik]

About /patterns/landmarks/examples/index, this page was renamed to general-principles.html to avoid confusion with the other pages called index.html. Do you find any references to that old page? If so you may have found a bug.