documentation: Clarify deployment requirements.
documentation: Clarify deployment requirements.

This commit removes the false statement that deploying
a bot requires an own Zulip development server and
updates the instructions respectively.

vabs22/zulip,timabbott/zulip,vaidap/zulip,rishig/zulip,showell/zulip,timabbott/zulip,rht/zulip,zulip/zulip,rht/zulip,mahim97/zulip,amanharitsh123/zulip,showell/zulip,rishig/zulip,brainwane/zulip,ryanbackman/zulip,shubhamdhama/zulip,jphilipsen05/zulip,timabbott/zulip,brainwane/zulip,amanharitsh123/zulip,shubhamdhama/zulip,synicalsyntax/zulip,amanharitsh123/zulip,kou/zulip,brockwhittaker/zulip,vaidap/zulip,verma-varsha/zulip,verma-varsha/zulip,eeshangarg/zulip,andersk/zulip,brockwhittaker/zulip,eeshangarg/zulip,j831/zulip,j831/zulip,dhcrzf/zulip,punchagan/zulip,Galexrt/zulip,mahim97/zulip,jrowan/zulip,rishig/zulip,synicalsyntax/zulip,andersk/zulip,vaidap/zulip,ryanbackman/zulip,Galexrt/zulip,brainwane/zulip,vaidap/zulip,vaidap/zulip,brainwane/zulip,christi3k/zulip,christi3k/zulip,ryanbackman/zulip,jphilipsen05/zulip,zulip/zulip,shubhamdhama/zulip,kou/zulip,christi3k/zulip,eeshangarg/zulip,vabs22/zulip,shubhamdhama/zulip,amanharitsh123/zulip,j831/zulip,eeshangarg/zulip,vabs22/zulip,mahim97/zulip,ryanbackman/zulip,brainwane/zulip,showell/zulip,brainwane/zulip,jackrzhang/zulip,andersk/zulip,amanharitsh123/zulip,Galexrt/zulip,jphilipsen05/zulip,mahim97/zulip,eeshangarg/zulip,hackerkid/zulip,showell/zulip,vabs22/zulip,jackrzhang/zulip,hackerkid/zulip,christi3k/zulip,andersk/zulip,zulip/zulip,showell/zulip,jphilipsen05/zulip,synicalsyntax/zulip,rht/zulip,rht/zulip,punchagan/zulip,Galexrt/zulip,Galexrt/zulip,brockwhittaker/zulip,punchagan/zulip,andersk/zulip,eeshangarg/zulip,verma-varsha/zulip,synicalsyntax/zulip,kou/zulip,j831/zulip,timabbott/zulip,rht/zulip,eeshangarg/zulip,brockwhittaker/zulip,jrowan/zulip,shubhamdhama/zulip,andersk/zulip,tommyip/zulip,dhcrzf/zulip,punchagan/zulip,tommyip/zulip,Galexrt/zulip,brainwane/zulip,Galexrt/zulip,mahim97/zulip,andersk/zulip,dhcrzf/zulip,jrowan/zulip,tommyip/zulip,synicalsyntax/zulip,dhcrzf/zulip,dhcrzf/zulip,vabs22/zulip,shubhamdhama/zulip,synicalsyntax/zulip,jackrzhang/zulip,jrowan/zulip,jackrzhang/zulip,tommyip/zulip,hackerkid/zulip,christi3k/zulip,verma-varsha/zulip,rht/zulip,kou/zulip,rht/zulip,rishig/zulip,tommyip/zulip,punchagan/zulip,punchagan/zulip,zulip/zulip,brockwhittaker/zulip,jackrzhang/zulip,punchagan/zulip,jrowan/zulip,ryanbackman/zulip,timabbott/zulip,synicalsyntax/zulip,tommyip/zulip,amanharitsh123/zulip,kou/zulip,jphilipsen05/zulip,rishig/zulip,jackrzhang/zulip,kou/zulip,zulip/zulip,hackerkid/zulip,rishig/zulip,showell/zulip,dhcrzf/zulip,rishig/zulip,hackerkid/zulip,vaidap/zulip,timabbott/zulip,ryanbackman/zulip,verma-varsha/zulip,shubhamdhama/zulip,tommyip/zulip,verma-varsha/zulip,jrowan/zulip,timabbott/zulip,vabs22/zulip,mahim97/zulip,brockwhittaker/zulip,kou/zulip,showell/zulip,hackerkid/zulip,zulip/zulip,zulip/zulip,jackrzhang/zulip,christi3k/zulip,j831/zulip,j831/zulip,dhcrzf/zulip,jphilipsen05/zulip,hackerkid/zulip