app.js: add missing routes for configurable paths
app.js: add missing routes for configurable paths

Signed-off-by: WilliButz <a35924c242b991c8567954e9072f1b416a10229c@cyberfnord.de>

hackmdio/hackmd,jackycute/HackMD,hackmdio/hackmd,hackmdio/hackmd,Yukaii/hackmd,Yukaii/hackmd,jackycute/HackMD,jackycute/HackMD,Yukaii/hackmd