Quickstart discord channel and remix script

[uF4No]

Description

• Fixes contract names in quickstart channel
• Adds Remix paymaster script
• Fix Discord channel name for quickstart support

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit e7fbc82):

https://zksync-docs-staging-5eb09--pr112-fix-quick2-f8yyaysk.web.app

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[github-actions[bot]]

:tada: This PR is included in version 1.0.1 :tada:

The release is available on GitHub release

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