🐛Fixed slugs containing the word `amp` result in 404s when serving the amp version (#9722)
🐛Fixed slugs containing the word `amp` result in 404s when serving the amp version (#9722)

closes #9715

- changed the `urlWithoutSubdirectoryWithoutAmp` variable in the amp
router to only match /amp or /amp/ at the end of the url string, instead
of just matching any occurrence of /amp in the url string
Kikobeats/Ghost,Kikobeats/Ghost,JohnONolan/Ghost,TryGhost/Ghost,Gargol/Ghost,TryGhost/Ghost,ErisDS/Ghost,e10/Ghost,ErisDS/Ghost,ErisDS/Ghost,bitjson/Ghost,JohnONolan/Ghost,bitjson/Ghost,janvt/Ghost,janvt/Ghost,TryGhost/Ghost,kevinansfield/Ghost,kevinansfield/Ghost,Gargol/Ghost,JohnONolan/Ghost,kevinansfield/Ghost,Kikobeats/Ghost,e10/Ghost