update search results page to include "advanced search" linking to datatracker and mail list archives

[ghwood]

URL

See current default result page:

https://www7.ietf.org/search/?query=BCP+38

Expected Behavior

(What did you think was supposed to happen? How did you think it should look?)

Actual Behavior

(include a screen shot if you like)

Reproducing

• Browser:
• OS: [Operating System name] [Version]
• (anything else you think we might need to reproduce this)

[ghwood]

has been addressed.