New Docs: Added redirects for old docs URL

[mrdoob]

Related issue: #30748

Description

Ensure the old URLs still work.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	338.24 79.14	338.24 79.14	+0 B +0 B
WebGPU	589.46 162.82	589.46 162.82	+0 B +0 B
WebGPU Nodes	588.06 162.58	588.06 162.58	+0 B +0 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	469.7 113.74	469.7 113.74	+0 B +0 B
WebGPU	658.79 178.24	658.79 178.24	+0 B +0 B
WebGPU Nodes	612.8 167.43	612.8 167.43	+0 B +0 B

[mrdoob]

Turns out Google results are like this:

https://threejs.org/docs/api/en/geometries/BoxGeometry.html

And not like this:

https://threejs.org/docs/#api/en/geometries/BoxGeometry

So all the google search links were giving 404 last night... 😱

Claude to the rescue! a121a1c

I thought about redirecting to the archived docs for safety...

https://archive.threejs.org/docs/#api/en/geometries/BoxGeometry

But decided to redirect to the current docs instead, even if some links may fail...?

[mrdoob]

Oh no...

Now Google is also giving this result:
https://threejs.org/docs/pages/BoxGeometry.html

[mrdoob]

Fixed. I hope.. 50f79bb

[mrdoob]

I wonder how long will these results last..