Several bugfixes

[2.8.7] - 2026-02-28

Fixed

• types on FPDF.title, FPDF.add_font() and FPDF.output()
• added missing files to navigation tree in mkdocs.yml - thanks to @paulsuh

Changed

• reverted changes to ImageInfo that impacted user-facing API
• prefer outline glyphs over bitmap if the font has both