[FEATURE] Add Search Capablity to Garvitino Docs

[chenyuan99]

Describe the feature

As a developer, I would love to search through the docs on the website https://gravitino.apache.org/docs/0.7.0-incubating/

but I couldnt find a search bar, it would be super helpful if we could have that.

Motivation

No response

Describe the solution

No response

Additional context

No response

[chenyuan99]

for https://datastrato.ai/docs/0.5.1/ it does have search capability, could we use the same solution? is it allowed/made exceptions by ASF?