Updates for the Taquito-based NFT tutorial (#115)

* Rename to Mint an NFT using Taquito

* Move the tutorials under a container topic

* It also keeps a ledger that records which account owns each NFT.

* Intro

* Copy what is an NFT section from the tznft tutorial

* Prereqs and Pinata account

* Improvements to original IPFS instructions

* Info about the contract

* Deploying the contract

* Download the tutorial files

* Consistency in emphasis

* tweaks

* Application and diagrams

* Address of the contract is important

* Running and testing the app

* incorporating info from previous version

* entrypoints

* Conclusion

* titles

* Need a wallet and some funds

* deploy -> originate

* client -> sender

* variable -> property

* Incomplete line

* Creating NFTs is called minting

* 5 seconds by default

* Pinata requires authentication

* correct path to image

* typo: be originated

src/components/Layout.jsx

@@ -294,8 +294,12 @@ const tutorialNavigation = [
         href: '/tutorials/create-an-nft',
         children: [
           {
-            title: 'Mint NFT using Taquito and Pinata',
-            href: '/tutorials/create-an-nft/nft-pinata',
+            title: 'Create an NFT with the `tznft` tool',
+            href: '/tutorials/create-an-nft/nft-tznft',
+          },
+          {
+            title: 'Create a web app that mints NFTs',
+            href: '/tutorials/create-an-nft/nft-taquito',
           },
         ],
       },