RFR: JDK-8248863: Add search landing page to API documentation

[Hannes Wallnöfer]

On Wed, 13 Apr 2022 16:01:17 GMT, Hannes Wallnöfer <hannesw at openjdk.org> wrote:

> This is the second of two PRs to enhance JavaDoc search, it is based on the first one (#8185).
> 
> It adds a standalone search page (search.html) along with its own script file (search-page.js). This PR is very similar to the last prototype I uploaded and demoed, the changes are mostly tweaks to the markup, style sheets and text. 
> 
> JDK API docs rendered with this patch can be viewed and tested here (top-level files only):
> http://cr.openjdk.java.net/~hannesw/8248863/api.01/

@jonathan-gibbons thanks for the comments, I added a commit addressing the issues you pointed out.

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PR: https://git.openjdk.java.net/jdk/pull/8226