[Docs]: Performance best practices

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Each framework or product has best practices in order to eke performance from that framework. Like our security docs, we should publish a document around best practices to improve the performance of Appsmith apps.

This includes:
1. Paginating queries
2. Performing aggregation on the server instead of pulling a lot of data to the browser.
3. Design multiple pages instead of loading a single page with many widgets.
4. Following best practices of JS code to avoid infinite loop or intensive computations.