Recommend Pantheon Secrets instead of Lockr

[ccharlton]

Fixes #9200
Fixes #9190

Summary

Swapped out Lockr for Pantheon Secrets
Recommend Pantheon Secrets first, and private secrets.json file as an alternative

• Integrations
• Devleop
• Guides
• Automate
• Security
• Secrets Management in WordPress
• Private Paths for Code and Files
• Quicksilver Install Scripts

I kept the Lockr content for now but added deprecated warning to the top and the title

[ccharlton]

I couldn't find how to edit the following:

• https://docs.pantheon.io/automate
• https://docs.pantheon.io/guides
• https://docs.pantheon.io/develop

[pantheon-decoupled]

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[pantheon-decoupled]

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[pantheon-decoupled]

⚡ Deployed with Pantheon Decoupled

This build was successfully deployed with Pantheon. You can track the build logs here.

👀 Preview: https://pr-9247-documentation.appa.pantheon.site
🛠️ Manage in Pantheon: https://dashboard.pantheon.io/site/2b30153f-e8b1-4427-b076-6109e704ba5d/overview

[pantheon-decoupled]

⚡ Deployed with Pantheon Decoupled

This build was successfully deployed with Pantheon. You can track the build logs here.

👀 Preview: https://pr-9247-documentation.appa.pantheon.site
🛠️ Manage in Pantheon: https://dashboard.pantheon.io/site/2b30153f-e8b1-4427-b076-6109e704ba5d/overview

[pantheon-decoupled]

⚡ Deployed with Pantheon Decoupled

This build was successfully deployed with Pantheon. You can track the build logs here.

👀 Preview: https://pr-9247-documentation.appa.pantheon.site
🛠️ Manage in Pantheon: https://dashboard.pantheon.io/site/2b30153f-e8b1-4427-b076-6109e704ba5d/overview

[rachelwhitton]

Thanks for kicking this pr off @ccharlton! I did an audit and added every occurance of Lockr I found across the repo to this PR, if you have time / interest to review my changes please do!

@jazzsequence can you review the following as part of this PR:

• Secrets Management in WordPress
• Private Paths for Code and Files
• Quicksilver Install Scripts

I kept the Lockr content for now but added deprecated warning to the top and the title

[jazzsequence]

@rachelwhitton LGTM with the couple (minor) code style changes I suggested to the pantheon_get_secrets code blocks.

[pantheon-decoupled]

⚡ Deployed with Pantheon Decoupled

This build was successfully deployed with Pantheon. You can track the build logs here.

👀 Preview: https://pr-9247-documentation.appa.pantheon.site
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[pantheon-decoupled]

⚡ Deployed with Pantheon Decoupled

This build was successfully deployed with Pantheon. You can track the build logs here.

👀 Preview: https://pr-9247-documentation.appa.pantheon.site
🛠️ Manage in Pantheon: https://dashboard.pantheon.io/site/2b30153f-e8b1-4427-b076-6109e704ba5d/overview

[pantheon-decoupled]

⚡ Deployed with Pantheon Decoupled

This build was successfully deployed with Pantheon. You can track the build logs here.

👀 Preview: https://pr-9247-documentation.appa.pantheon.site
🛠️ Manage in Pantheon: https://dashboard.pantheon.io/site/2b30153f-e8b1-4427-b076-6109e704ba5d/overview