Fixes and improvements (#28)

* Update collection creation error messages

* Update minimum unit price

* Update .env.example

* Fix double ustars conversion for whitelist & minter unit_price

* Add minimum unit price for whitelisted addresses

* Fix: Invalid baseTokenURI error during collection instantiation

* Collection cover image URI update

* Minimum unit price update - 2

* Fix: nonfunctional existing whitelist option

* Check matching asset and metadata file arrays before creating a collection

* Mark minting detail inputs as required

* Fix: collection creation with the specified royalty preference

* Fix: whitelistType change problem

* Fix creation logic

* Automate number of tokens input & check per address limit

* Automate number of tokens input & check per address limit - 2

* Metadata files should have .json extensions

* Check royalty percentage

* Upload service related changes now trigger state updates

Co-authored-by: findolor <anakisci@gmail.com>

.env.example

@@ -1,8 +1,9 @@
 APP_VERSION=0.1.0
 
-NEXT_PUBLIC_SG721_CODE_ID=5
-
 NEXT_PUBLIC_PINATA_ENDPOINT_URL=https://api.pinata.cloud/pinning/pinFileToIPFS
+NEXT_PUBLIC_WHITELIST_CODE_ID=3 
+NEXT_PUBLIC_MINTER_CODE_ID=2
+NEXT_PUBLIC_SG721_CODE_ID=1
 
 NEXT_PUBLIC_API_URL=https://
 NEXT_PUBLIC_BLOCK_EXPLORER_URL=https://testnet-explorer.publicawesome.dev/stargaze
@@ -13,4 +14,4 @@ NEXT_PUBLIC_S3_BUCKET=   # TODO
 NEXT_PUBLIC_S3_ENDPOINT= # TODO
 NEXT_PUBLIC_S3_KEY=      # TODO
 NEXT_PUBLIC_S3_REGION=   # TODO
-NEXT_PUBLIC_S3_SECRET=   # TODO
+NEXT_PUBLIC_S3_SECRET=   # TODO