Redirect misc broken homepage links

[jonoaldersonwp]

The following URLs should trigger a 301 redirect to ​https://wordpress.org.
In each case, special consideration should be given to ensure that the various forms of character encoding correctly trigger the redirect (e.g., a 'space' character, vs %20, curly brackets vs econded formats, etc).

• https://wordpress.org/ target=
• https://wordpress.org/ rel=
• https://wordpress.org/contact
• https://wordpress.org/index.html
• https://wordpress.org/+
• https://wordpress.org/” target=
• https://wordpress.org/' rel='external nofollow
• https://wordpress.org/rel=external"

NB, Bing Search Console reports over 13,000 links pointing at these URLs, so 'reclaiming' these should have a marked impact on PageRank flow to/through these URLs.

[dd32]

In 10487:

Redirects: Catch some malformed URL requests and redirect it to a better location.

Fixes #5528.

[dd32]

In 10488:

Redirects: If the redirect trimmed it back to , canonical needs at least a single slash as the path component of the URL.

See #5528.

[dd32]

In 10497:

Redirects: Trim off the sub directory path prefix before attempting to handle malformed urls.

See #5528, #5531.