(launch) fix: support rpc from envs

[Tanya-atatakai]

Fixes

1. fixes not all chains get rpc url from env variables
2. updates security headers with some popular rpcs

Types of changes

What types of changes does your code introduce?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

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