docs: update SD card guide with Tile-Generator links, Fonts and APRS Symbols sections - Update NAV tile generation link to Tile-Generator (devel_pack branch) - Add Fonts folder download link for vector tile labels - Add APRS Symbols folder download link for map icons - Keep reference to IceNav-v3 as original work
docs: update SD card tutorial with download_tiles and mass_copy instructions
docs: import comprehensive user guide (FR/EN) for v2.9.1