Updates quick install. Removes some commands options for jigasi, which are no longer needed.

doc/quick-install.md

 ### Install Jigasi
 
 ```sh
-apt-get -o Dpkg::Options::="--force-overwrite" -y install jigasi
+apt-get -y install jigasi
 ```
-
 or
 
 ```sh
 wget https://download.jitsi.org/jigasi_1.0-1_amd64.deb
-dpkg -i --force-overwrite jigasi_1.0-1_amd64.deb
+dpkg -i jigasi_1.0-1_amd64.deb
 ```
 
-You need to pass "--force-overwrite" option to dpkg, because the jigasi package patches some of the files in the jitsi-meet package in order to enable the SIP support in Jitsi Meet.
-
 During the installation you'll be asked to enter your SIP account and password. This account will be used to invite the other SIP participants.
 
 ### Reload Jitsi Meet