Organized and edited the README of Web PubSub client library#24743

Merged

2 commits merged intoAzure:mainfrom kevinguo-ed:kevin/web-pubsub-client

Feb 9, 2023

+167-137

Commits on Feb 6, 2023

Organized README so that it's easier to get started with this client library and easier to find further reference docs
Kaifei-Guo
committed

Commits on Feb 7, 2023

Fixed the links that used locale in the urls and a few minor formatting issues
kevinguo-ed
committed