Use the original VDM lettering with Theory beside it

[Llewellynvdm]

Requested wordmark correction

Replaces the homepage's background-bearing banner and detached THEORY caption with a single horizontal, transparent VAST DEVELOPMENT METHOD THEORY wordmark.

The blue letterforms are isolated from the supplied VDM logo. Existing letterforms are reused for the extension; matching R and Y forms complete THEORY. This avoids substituting an unrelated browser typeface. A small inline SVG arranges the raster lettering on one shared baseline and exposes one accessible name.

The wordmark has no mosaic, white rectangle, border, or separate caption, and it scales as a unit in light mode, dark mode, and narrow layouts. The obsolete banner asset is removed.

Scope

Only wordmark assets, the homepage wordmark markup, a scoped wordmark stylesheet, related branding notices, and five focused tests are changed. The paper, Markdown articles, publication builder, existing theme stylesheet, favicon, and GitHub Actions workflow are unchanged.

PR #1 has already been merged, so this is a separate two-commit follow-up based on current main.

Validation

Local unit tests, site generation, HTML/Markdown correspondence, and internal-link checks passed. Light/dark and mobile visual previews were inspected. The existing PR workflow will additionally run the full publication and desktop/mobile browser suite; its result will be recorded here before handoff.

No automatic merge or deployment is requested.

[Llewellynvdm]

Validation is complete for 0d62c421d05dc4496510c5e2278cdadec48d9ac7.

The existing Publication workflow passed, including unit tests, full site generation, HTML/Markdown checks, and the desktop/mobile browser suite. The local suite also passed all 52 tests; 62 HTML/Markdown pairs and 10,264 local links were verified.

The committed wordmark uses the source-derived blue lettering with THEORY on the same baseline and a transparent backdrop. Light, dark, and mobile previews were visually inspected. The new source assets have verified Git blob hashes and transparency checks.

The manuscript, all DOCS/ articles, the publication builder, original theme stylesheet, favicon, and GitHub Actions workflow remain unchanged. This is a two-commit wordmark-only follow-up to the already merged publication PR.

Ready for review and merge; not merged automatically.