Return direct link to class reference first when searching for a class reference entry

### Describe the project you are working on

I'm a high school teacher teaching game development in godot.

### Describe the problem or limitation you are having in your project

Often times, my students will want to understand a function better so they go to the online godot docs and type in the name of the function. For example, `str`. The search results say nothing about the String `str` function. Instead there are a lot of results for `AudioStreamPlayback` and other words that have a str as a substring.

The end result is they do not find information about the function they are searching for.

### Describe the feature / enhancement and how it helps to overcome the problem or limitation

Currently the online docs are just doing a substring search. of all the documentation pages.

For the use case of looking up a function name, the built-in "Search Help" feature works perfectly.

The "Search Help" feature in the engine should also be integrated into the online docs. That way if there is direct documentation it can show a link to that.

Additionally, the current substring search seems to not prioritize exact matches or page title matches over substring, in-document matches. I think this would also be a huge benefit to the usability of the online docs.

### Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

Clicking on the first result here `str()` would link to https://docs.godotengine.org/en/4.3/classes/class_@globalscope.html#class-globalscope-method-str

### If this enhancement will not be used often, can it be worked around with a few lines of script?

No this is a modification to how to docs website works.

### Is there a reason why this should be core and not an add-on in the asset library?

It's not a modification to the engine