Jennifer88huang opened a new pull request #4598: [docs]Refine Pulsar Functions overview and structure URL: https://github.com/apache/pulsar/pull/4598 Fixes #4554 ### Motivation We've proposed a new structure for Pulsar Functions in #4554, so I refine the overview file and part of structure. ### Modifications 1. Refine the Pulsar Functions overview. 2. Refine part of Pulsar Functions structure. 3. Currently, I keep the following parts in the sidebars.json unchanged. We're designing the "Language-specific Code Tabs" for website. After success, we can adopt the structure as advised by @sijie in #4554, and I'll create new files for this part. 
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