Fix broken/backwards links and a header typo across the wiki Corrects a typo'd page slug, two swapped link-text/target pairs, a lowercase page reference, an undefined reference-style link, and a broken image path pointing at a nonexistent _images/ folder, plus a misspelled "gtools" heading in Usage-gdtools.md. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Updated Developer Quickstart (markdown)
First draft of doc => wiki