Mobile Development: Update the docs + code of Solana Mobile Dapps with Expo (#461)

* Update solana-mobile-dapps-with-expo.md

* Run prettier the README file

* Update the type Nft

We don't use the @metaplex-foundation/js any more so we need to update the type NFT

* Update solana-mobile-dapps-with-expo.md

Fix README format

* Migrate to Pinata Cloud instead of NFT Storage because they stopped their classic service since June 2024

* Update to Pinata Upload Image and Upload Data

* Formatting + Remove unnecessary deps

* Fix NftProvider + Update ContentBox

* Update Code + Address all the issues

* Small Fix + remove rn-fetch-blob because we don't need anymore.

* Remove redundant console.log()

* Small Fix Env variable

* Update Docs + Small fix

* Update content/courses/mobile/solana-mobile-dapps-with-expo.md

* Update content/courses/mobile/solana-mobile-dapps-with-expo.md

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Co-authored-by: Mike MacCana <mike.maccana@gmail.com>

Author: XuananLe