docs: move overlay, progress, and webSocketURL examples to client

[snitin315]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

Motivation / Use-Case

move overlay and progress examples to client. Improve examples directory structure, more like schema.

Breaking Changes

None

Additional Info

In the future, we will add more examples for all client properties so it is better to structure them together.

[codecov]

Codecov Report

Merging #3721 (3a21c48) into master (8a3f0d8) will increase coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3721      +/-   ##
==========================================
+ Coverage   93.20%   93.35%   +0.15%     
==========================================
  Files          15       15              
  Lines        1324     1324              
  Branches      458      458              
==========================================
+ Hits         1234     1236       +2     
+ Misses         83       81       -2     
  Partials        7        7              

Impacted Files	Coverage Δ
lib/servers/WebsocketServer.js	97.14% <0.00%> (+5.71%)	⬆️

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