docs: add self-hosting documentation

[adrianjoshua-strutt]

Preview: https://d2a8cehsb9j05d.cloudfront.net

Adds documentation for the self-managed hosting feature (defineHosting, definePipeline, ampx deploy).

Pages added

• /deploy-and-host/self-hosting/ — Overview
• /deploy-and-host/self-hosting/getting-started/ — Install and first deploy
• /deploy-and-host/self-hosting/define-hosting/ — Configure hosting (domains, WAF, compute, CDK escape hatches)
• /deploy-and-host/self-hosting/define-pipeline/ — Set up CI/CD pipeline
• /deploy-and-host/self-hosting/external-pipelines/ — GitHub Actions, GitLab CI

Navigation

Updated src/directory/directory.mjs to add the self-hosting section under deploy-and-host.

Related: aws-amplify/amplify-backend#3211

[mergify]

@adrianjoshua-strutt, since a file was deleted from the src/pages and/or src/fragments directories, redirects might need to be set up so these previous pages do not 404. If redirects are needed, please answer these questions for each redirect that is needed:

• What is the source address of the redirect? (Where are you trying to redirect from?)

• What is the target address of the redirect? (Where are you trying to redirect to?)

• Type of redirect? 301 - permanent redirect or 302 - temporary redirect? (More info on Amplify Hosting redirects here: https://docs.aws.amazon.com/amplify/latest/userguide/redirects.html)

[adrianjoshua-strutt]

Redirects are already configured in redirects.json in this PR. All are 301 permanent redirects:

Source	Target	Type
/<platform>/deploy-and-host/hosting/	/<platform>/deploy-and-host/amplify-hosting/	301
/<platform>/deploy-and-host/hosting/<*>	/<platform>/deploy-and-host/amplify-hosting/<*>	301
/<platform>/deploy-and-host/fullstack-branching/	/<platform>/deploy-and-host/amplify-hosting/	301
/<platform>/deploy-and-host/fullstack-branching/branch-deployments/	/<platform>/deploy-and-host/amplify-hosting/branch-deployments/	301
/<platform>/deploy-and-host/fullstack-branching/pr-previews/	/<platform>/deploy-and-host/amplify-hosting/pr-previews/	301
/<platform>/deploy-and-host/fullstack-branching/secrets-and-vars/	/<platform>/deploy-and-host/amplify-hosting/secrets-and-vars/	301
/<platform>/deploy-and-host/fullstack-branching/share-resources/	/<platform>/deploy-and-host/amplify-hosting/share-resources/	301
/<platform>/deploy-and-host/fullstack-branching/custom-pipelines/	/<platform>/deploy-and-host/amplify-hosting/custom-pipelines/	301
/<platform>/deploy-and-host/fullstack-branching/cross-account-deployments/	/<platform>/deploy-and-host/amplify-hosting/cross-account-deployments/	301
/<platform>/deploy-and-host/fullstack-branching/mono-and-multi-repos/	/<platform>/deploy-and-host/amplify-hosting/mono-and-multi-repos/	301
/<platform>/deploy-and-host/fullstack-branching/monorepos/	/<platform>/deploy-and-host/amplify-hosting/monorepos/	301

All pages moved from hosting/ and fullstack-branching/ into amplify-hosting/ as part of a nav restructure. The ValidateRedirects CI check passes locally.

[osama-rizk]

Since we are auto detecting the framework, can omit this framework param and also it is already mentioned in configuration page.

[adrianjoshua-strutt]

Will do. Thanks!

[osama-rizk]

same here, Since we are auto detecting the framework, can omit this framework param and also it is already mentioned in configuration page.

[adrianjoshua-strutt]

I agree