nft_storage removed

[sepandhaghighi]

Reference Issues/PRs

What does this implement/fix? Explain your changes.

• nft_storage method removed
• Gateway enum removed
• demo.ipynb updated
• Test system modified

Any other comments?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.86%. Comparing base (3aa970c) to head (f5cf92a).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #261      +/-   ##
==========================================
+ Coverage   99.47%   99.86%   +0.39%     
==========================================
  Files           4        4              
  Lines         753      679      -74     
  Branches      113      105       -8     
==========================================
- Hits          749      678      -71     
+ Misses          2        0       -2     
+ Partials        2        1       -1     

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[sadrasabouri]

Looks good, it's sad to see NFT storage's going.