Remove neptune-client

[AleksanderWWW]

Before submitting checklist

• Did you update the CHANGELOG? (not for test updates, internal changes/refactors or CI/CD setup)
• Did you ask the docs owner to review all the user-facing changes?

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 74.10%. Comparing base (cf086c8) to head (e86028a).

Files	Patch %	Lines
src/neptune/internal/backends/hosted_client.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           dev/2.0    #1699   +/-   ##
========================================
  Coverage    74.10%   74.10%           
========================================
  Files          336      336           
  Lines        16484    16477    -7     
========================================
- Hits         12215    12210    -5     
+ Misses        4269     4267    -2     

Flag	Coverage Δ
macos	76.97% <85.71%> (+<0.01%)	⬆️
py3.7	77.19% <85.71%> (+<0.01%)	⬆️
ubuntu	77.01% <85.71%> (-0.06%)	⬇️
unit	77.19% <85.71%> (+<0.01%)	⬆️
windows	75.71% <85.71%> (+<0.01%)	⬆️

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[szysad]

LGTM 🚀

btw I think @normandy7 should take a look at docs