feat(developers): build out /developers hub + clean up navbar/footer

- Delete /trial and /download (incomplete placeholders, no SEO value).
- Replace the /developers placeholder (PlaceholderPage comingSoon) with
  a real, SEO-optimized hub page:
  * Single H1 keyworded for "developer-first logistics platform"
  * 6 building-block cards (REST API, SDKs, Webhooks, WebSockets,
    Extensions, Developer Console) each linking to its sub-page
  * Documentation section linking to docs/api, docs/cli,
    docs/extension-development, docs/
  * Open-source / GitHub callout with repo inventory
  * Developer FAQ (8 entries) wired to FAQSchema JSON-LD for rich
    snippets eligibility
  * SoftwareApplication JSON-LD (DeveloperApplication category)
  * Server-component (no client JS shipped) so all content is in the
    initial HTML payload for crawlers
- Resources navbar dropdown: drop the megaMenu 2-column layout,
  remove the "Customer Stories" entry (was lazily linking to /oli-max),
  and re-order so Compare + Commercial License sit after Changelog.
- Footer: drop /download from the hideFooter pathname check now that
  the route is gone.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: roncodes