* Added waku README.md, starting text and structure
Resolves GH-1944
* Added api, config and doc details
* Created Docs for waku.const, envelope and events
* Added notes on Filter
* Rewrote the filter section
* Restructured docs to match new versioning structure
* Moved package files out of the main ToC
* Added waku/common/README.md
* Added details to mailserver.go and notes to api.go
* Update to bloomfilter and const common
* Added common/ helpers.go, errors.go and message.go details
* Added common/metrics.go and protocol details
* Added rate_limiter and topic.go details
* fix rate limiter table
* Added Waku Versioning details
* Added Versioned sub-package file details
* Added better detail for Waku Filters
Addressing https://github.com/status-im/status-go/pull/1949#discussion_r419232235
* Added notes about light nodes not being actually new
* Added more detail for Waku node configs and defaults
* Added details to the version message.go section
* Added details to waku/common/rate_limiter
* Minor typo fix in docs
Jakub Sokołowski
Samuel Hawksby-Robinson