docs: add Web UI page (browser version at huzpsb.github.io/pdfcpu2); link from Home and sidebar
docs: add Obfuscate page (garbage fill CID cmap + ToUnicode); link from Home/Roadmap/Sidebar/Solidify/Text-Extraction
docs: add Render & Solidify pages; mark render available across Home/Roadmap/OCR/Go-API/Sidebar
docs: complete wiki — command reference (CLI + Go API) for all commands, fork features (extract text, OCR), benchmarks
Initial Home page