Update tiernft testnet

[elPiablo]

from issue: #227 (comment)

Changes needed

Mumbai is being retired. TierNFT lesson and Connect to Front-end lessons need upgraded:

https://polygon.technology/blog/polygon-pos-is-cooking-the-napoli-upgrade-means-better-ux-the-mumbai-testnet-takes-a-bow

• remove reference to "scripts/ where simple automation scripts go"
• change to:
  rm contracts/*.sol
rm test/*.js
  by removing rm scripts/*.js as it doesn't come with the build anymore
• learner must create scripts/deploy.js dir and file
• change hardhat.config.js with new RPC details: https://polygon.technology/blog/polygon-pos-and-polygon-zkevm-new-testnets-for-polygon-protocols for Amoy Testnet
• update "Adding the testnet network paragraph with new details 👆🏼
  ..
• This one is not a deal breaker, but it would be nice to know how do I do grab the path to this? Typically it would be: [Introduction to web3 Wallets](../../../pages/fundamentals/wallets.mdx) but it returns a 404 page error
  ..
• asset update screenshot from Mumbai to Amoy
• check if URL for test token faucet is correct - add alternatives or additional URL possibilites
• asset update screenshot re: faucet if necessary
• under Personal Security paragraph, format the current paragraph from text to a bulleted list for Zerion steps
  ..
• change deploy command to npx hardhat run scripts/deploy.js --network amoy
• asset update screenshot for deploy terminal output
• change mint command to npx hardhat run scripts/mint.js --network amoy
• asset update screenshot for mint terminal output
• asset update OpenSea (if possible) with link to new NFTs
• create lesson summary
• update titles of other lessons when they're referenced, e.g. in intro and outro

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[github-actions]

Running Lighthouse audit...

[elPiablo]

Hey @Markkos89

How would I add a path (inside the TierNFT lesson) to this lesson on web3 wallets which is inside Fundamentals?

Typically we would do this: [Introduction to web3 Wallets](../../../pages/fundamentals/wallets.mdx), but I get a 404 error, so I guess our Next.js config doesn't allow us to use this standard path, right?

It's not a deal breaker for this PR. I was just wondering how we can easily use links to bring the learner to other areas of the platform. Sometimes very handy.

Just so you know where I'm trying to put it in, here's a screenshot from TierNFT lesson's .mdx:

[elPiablo]

@Markkos89 could you do a quick review of this?
and regarding this:

This one is not a deal breaker, but it would be nice to know how do I do grab the path to this? Typically it would be: Introduction to web3 Wallets but it returns a 404 page error

is there an easy way to implement this path as a simple URL to grab this lesson from Fundamentals? or do we need to add it as a component? It's not super important btw.