added link to NFT wiki on home page

[matthailu12]

Thank you for your contribution to the KodaDot NFT gallery.

👇 _ Do a quick check before the merge.

PR type

• Bugfix
• Feature
• Refactoring

Before submitting Pull Request, please make sure:

• My contribution builds clean without any errors or warnings
• I've merged recent default branch -- main and I've no conflicts
• I've tried respect high code quality standards
• I've didn't break any original functionality
• I've posted screenshot of demonstrated change in this PR

Optional

• I've tested it at </rmrk/collection/26902bc2f7c20c546a-1FVG7>
• I've tested PR on mobile and everything works
• I found edge cases

What's new?

• PR closes #<issue_number>
• <added a button on the home page that takes the user to https://en.wikipedia.org/wiki/Non-fungible_token to teach them about what NFTs are>

Had issue bounty label ?

• Fill up your KSM address: Payout

Community participation

• Are you at KodaDot Discord?

Screenshot

• [] My fix has changed something on UI, a screenshot for others, is best to understand changes.

[netlify]

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[yangwao]

okay, this is cute!

[yangwao]

let's grab some issue from our issues to get bounty!