Update installation.md (#5216)
Update installation.md (#5216)

Updated repository URL
pdanpdan/quasar,quasarframework/quasar,fsgiudice/quasar,pdanpdan/quasar,quasarframework/quasar,rstoenescu/quasar-framework,rstoenescu/quasar-framework,fsgiudice/quasar,quasarframework/quasar,quasarframework/quasar,pdanpdan/quasar,fsgiudice/quasar,pdanpdan/quasar,rstoenescu/quasar-framework