🌐 Add Italian translation for `docs/it/docs/index.md`

[matteospanio]

add italian translation for index docs page based on PR #1576 by @csr and reviewed by @bsab, @PieroMacaluso and @rpalloni

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (cf73051) 100.00% compared to head (f267846) 100.00%. Report is 1086 commits behind head on master.

:exclamation: Current head f267846 differs from pull request most recent head a19275d. Consider uploading reports for the commit a19275d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##            master     #5233    +/-   ##
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  Coverage   100.00%   100.00%            
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  Files          540       532     -8     
  Lines        13969     13684   -285     
==========================================
- Hits         13969     13684   -285     

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[github-actions[bot]]

📝 Docs preview for commit f267846fdbf730323e4bb718144a9d54b995d6eb at: https://62ec2c22488b4a3263a06921--fastapi.netlify.app

[matteospanio]

Since it was a one year old PR I updated the translation with @Ale-Cas contributions and I pulled the latest code update from master branch.

[tiangolo]

📝 Docs preview for commit 96b0efbba3750ef8c77df0a6eb82b791a5ce1cc6 at: https://100687c6.fastapitiangolo.pages.dev

[tiangolo]

📝 Docs preview for commit a19275d1157a0dc3a184829df146011d1d9145ef at: https://814637cf.fastapitiangolo.pages.dev

[alejsdev]

Thanks for your work @matteospanio 🤓

And thanks for your help @Ale-Cas 🚀✨