CIS Compliance Guide Improvements

[rhoboat]

A friend of #441 .

Issues covered from that PR:

Cleanup tasks:

• Change accounts declaration from accounts = {x,y,z} to accounts = jsondecode(file("accounts.json")) See comment
• Update local.accounts["stage"] to local.accounts.stage to be consistent across guides (e.g. the LZ guide) See comment
• Review references of accounts such as in this comment
• Replace name_prefix = "stage-logs" with something unique like name_prefix = "<SOME UNIQUE IDENTIFIER>-logs" - see this comment
• Removed one case of infrastructure-modules being referenced.
• Move more stuff into common.hcl.

Readability tasks:

• Introduce a common.hcl to hold hard-coded values that are repeated across the code examples - See this comment

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[ina-stoyanova]

Left a few comments. I think once we are clear on Jim's comments, this should be good to go! Thanks for picking this up, Rho! 🙇

[ina-stoyanova]

Could I get another set of 👀 on this? The last relevant changes should resolve the comments above.

[ina-stoyanova]

This is ready for another look @marinalimeira when you can :)

[marinalimeira]

LGTM

[ina-stoyanova]

Thank you @marinalimeira! Merging now 🎉