[FEATURE] Randomised Generic Metadata Images about create-and-mint-nft-collection HOT 1 CLOSED

Updated the constants/nft_details.js genericURL field from a single key:value field to a key:array field. The updated field name is now called genericURLs.
"genericURLs: ["GENERIC_URL_#1_HERE", "GENERIC_URL_#2_HERE", "GENERIC_URL_XXX_HERE"]"

Users can now simply add a list of IPFS URLs of the images that they have manually uploaded, to the genericURLs array and when the "update_json_to_generic_meta.js" script is used, it will randomly pick one of the URLs in this array and assign it to the edition. If the user only wants a single generic image, then they can simply put the single url in there.

For example:

• 1 generic URL - genericURLs: ["https://ipfs.io/ipfs/bafybeifipag6zgekhcczypcsv4qqvoul6yobw22f3ga3hetoaqinn2xova"]

• 2 generic URLs - genericURLs: ["https://ipfs.io/ipfs/bafybeifipag6zgekhcczypcsv4qqvoul6yobw22f3ga3hetoaqinn2xova", "https://ipfs.io/ipfs/bafkreic7glqatx6lzay2hl2xn5n5p75f4njobiza5ianuryvjhgauckh2m"]

• 3 generic URLs - genericURLs: ["https://ipfs.io/ipfs/bafybeifipag6zgekhcczypcsv4qqvoul6yobw22f3ga3hetoaqinn2xova", "https://ipfs.io/ipfs/bafkreic7glqatx6lzay2hl2xn5n5p75f4njobiza5ianuryvjhgauckh2m", "https://ipfs.io/ipfs/bafkreihabbil5ueqrn4fvfvoywmzrvk7jgcioza7svulj4vfxphrkuzgfu"]

from create-and-mint-nft-collection.