Update readme

[MattPerreault]

• Fixed some broken links.
• Added some others.
• Cleaned up the formatting.
• Fixed commands to be more generic.
• Added a small note about using the 1password-cli for Linux.
• Verified everything worked (mostly) up until the op run -- tilt up command.

[MattPerreault]

@kcirtapfromspace bump :smile:

[kcirtapfromspace]

🎉 thanks though

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