docs: Add SearchApi tool documentation

[SebastjanPrachovskij]

Added SearchApi tool documentation.

Integration PR: https://github.com/n8n-io/n8n/pull/10845

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[imchairmanm]

Hey @SebastjanPrachovskij,

Thank you so much for your contribution and for putting together documentation for your node submission. In light of our transition to the Community Node Repository that @Joffcom mentioned in the integration PR, I'm going to close this ticket for now since the node submission process has changed. Thanks again though for all of your hard work on this!