TEST — DocumenterVitepress#359 deploy_url fix (do not merge)

[asinghvi17]

Purpose

This is a test build only — it points DocumenterVitepress at the as/deploy-url-fixes branch (LuxDL/DocumenterVitepress.jl#359) via a [sources] override in docs/Project.toml, to verify that GeometryOps's docs build correctly with that PR's fix to how MarkdownVitepress derives the VitePress base path from repo/deploy_url.

PR #359 fixes:

• the URL-scheme regex (^https?:// instead of the old r"http[s?]://", which never matched plain http://)
• trailing slashes are now stripped from repo/deploy_url
• custom-domain deploy URLs with subpaths are now handled correctly

GeometryOps's docs/make.jl calls MarkdownVitepress(repo = "github.com/JuliaGeo/GeometryOps.jl") (no explicit deploy_url), so this build exercises the repo-derived base-path logic, including for PR preview deploys (push_preview = true in deploydocs).

Change

Only docs/Project.toml was touched, adding one line to the existing [sources] table:

```toml
DocumenterVitepress = {url = "https://github.com/LuxDL/DocumenterVitepress.jl", rev = "as/deploy-url-fixes"}
```

No source, docs content, or CI changes.

This PR MUST NOT be merged

It exists solely to trigger a docs CI build against an unreleased branch of a dependency. Once the build/preview is verified, this PR should be closed (not merged) and the branch deleted.

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