Add a basic guide for generic OAuth providers.

[shadownetdev1]

Closes tinyauthapp/tinyauth#921

I was going to run the Astro Documentation and validate everything, but it failed during the install of sharp on my machine. :(

I suspect that there is some cleanup to be done or something that I missed. Thanks for making such a great project! I have only been playing around with it for a half hour or so, but it has shown great potential. I cannot wait to use it to replace my three dozen or so basic http authentications.

Error from when attempting to run npm install:

npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: 'tinyauth-docs@0.0.1',
npm warn EBADENGINE   required: { node: 'v25.5.0' },
npm warn EBADENGINE   current: { node: 'v26.2.0', npm: '11.14.1' }
npm warn EBADENGINE }
npm error code 1
npm error path /home/user/tinyauthdocs/node_modules/sharp
npm error command failed
npm error command sh -c node install/check.js || npm run build
npm error > sharp@0.34.5 build
npm error > node install/build.js
npm error
npm error sharp: Attempting to build from source via node-gyp
npm error sharp: See https://sharp.pixelplumbing.com/install#building-from-source
npm error sharp: Please add node-addon-api to your dependencies
npm error A complete log of this run can be found in: /home/<redacted>/.npm/_logs/2026-06-05T17_03_03_182Z-debug-0.log

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 119d2733-9e93-47a8-b993-18445c3d5db0

📥 Commits

Reviewing files that changed from the base of the PR and between b34cd53 and 431e74d.

📒 Files selected for processing (2)

• astro.config.mjs
• src/content/docs/docs/guides/generic-oauth.mdx

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