docs: use the wordmark blue across the whole site

[yesbert]

What this changes

• The accent was only redirected on the landing page, so every other page still drew Bootstrap's default #0d6efd — a visibly different, more violet blue than the wordmark. The --bs-primary, --bs-primary-rgb and --bs-link-* variables now read the --st-accent* variables site-wide, which recolours links, breadcrumbs, the active table-of-contents entry, focus rings and anything else derived from them in one place.
• Both themes read the same accent variables, so dark mode needs no second rule; the dark accent stays the lifted #3d97e6 for contrast.

How it was verified

• Local gauntlet green (./scripts/local-gauntlet.sh)
• docfx build --warningsAsErrors — 0 warnings, 0 errors
• Sampled the rendered pixels on a content page: breadcrumb and active table-of-contents entry are #0673cb, the wordmark blue, where they were #0d6efd before

[Copilot]

🟢 Approval recommended

The change is a low-risk CSS variable remapping that should consistently apply the intended accent color site-wide.

Pull request overview

This PR aligns DocFX/Bootstrap-derived UI accent styling across the documentation site to consistently use the Stratara wordmark blue (and its dark-mode lift), rather than Bootstrap’s default primary blue on non-landing pages.

Changes:

• Redirects Bootstrap --bs-primary* and --bs-link-* variables to the existing --st-accent* variables at the site scope (not just the landing page).
• Keeps dark mode using the same accent variable mechanism, relying on the dark-theme override of --st-accent*.

File summaries

File	Description
docs/templates/stratara/public/main.css	Rebinds Bootstrap primary/link CSS variables to Stratara accent variables site-wide to unify the brand blue across all pages/themes.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Lite

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