Modify setup_secrets.sh to use hcp instead of vlt

[aadhyaaamashru]

Notion ticket link

Modify setup_secrets.sh to use hcp instead of vlt

Implementation description

• the script should download all secrets from the hashiCorp vault to a .env file.
• updated it to use hcp instead of vlt

Steps to test

1. run the script to make sure it correctly creates the .env again and consists of all secrets from HashiCorp

What should reviewers focus on?

Checklist

• My PR name is descriptive and in imperative tense
• My commit messages are descriptive and in imperative tense. My commits are atomic and trivial commits are squashed or fixup'd into non-trivial commits
• I have run the appropriate linter(s)
• I have requested a review from the PL, as well as other devs who have background knowledge on this PR or who will be building on top of this PR

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[ChinemeremChigbo]

Removed some uneeded whitespace (linting) and updated the README. LGTM otherwise!