user docs: Reorganize account basics section.
user docs: Reorganize account basics section.

This section should be the stuff we want users to see when they are first
setting up their account.

This commit only moves links on the sidebar around, no additions or
deletions.

shubhamdhama/zulip,jackrzhang/zulip,kou/zulip,Galexrt/zulip,eeshangarg/zulip,Galexrt/zulip,hackerkid/zulip,shubhamdhama/zulip,eeshangarg/zulip,andersk/zulip,shubhamdhama/zulip,tommyip/zulip,eeshangarg/zulip,rht/zulip,showell/zulip,tommyip/zulip,brainwane/zulip,synicalsyntax/zulip,mahim97/zulip,andersk/zulip,mahim97/zulip,zulip/zulip,brockwhittaker/zulip,Galexrt/zulip,shubhamdhama/zulip,jackrzhang/zulip,rishig/zulip,rishig/zulip,tommyip/zulip,rht/zulip,dhcrzf/zulip,dhcrzf/zulip,hackerkid/zulip,rht/zulip,Galexrt/zulip,brainwane/zulip,eeshangarg/zulip,timabbott/zulip,hackerkid/zulip,showell/zulip,kou/zulip,rishig/zulip,hackerkid/zulip,dhcrzf/zulip,rishig/zulip,brainwane/zulip,dhcrzf/zulip,dhcrzf/zulip,timabbott/zulip,timabbott/zulip,rishig/zulip,mahim97/zulip,dhcrzf/zulip,zulip/zulip,showell/zulip,jackrzhang/zulip,kou/zulip,jackrzhang/zulip,rht/zulip,zulip/zulip,tommyip/zulip,timabbott/zulip,shubhamdhama/zulip,showell/zulip,kou/zulip,hackerkid/zulip,rishig/zulip,rht/zulip,synicalsyntax/zulip,andersk/zulip,brainwane/zulip,hackerkid/zulip,timabbott/zulip,punchagan/zulip,tommyip/zulip,punchagan/zulip,kou/zulip,tommyip/zulip,synicalsyntax/zulip,zulip/zulip,Galexrt/zulip,eeshangarg/zulip,brainwane/zulip,andersk/zulip,rishig/zulip,synicalsyntax/zulip,synicalsyntax/zulip,zulip/zulip,showell/zulip,dhcrzf/zulip,punchagan/zulip,brockwhittaker/zulip,eeshangarg/zulip,andersk/zulip,Galexrt/zulip,brockwhittaker/zulip,kou/zulip,synicalsyntax/zulip,kou/zulip,tommyip/zulip,mahim97/zulip,timabbott/zulip,brainwane/zulip,brockwhittaker/zulip,punchagan/zulip,jackrzhang/zulip,Galexrt/zulip,punchagan/zulip,jackrzhang/zulip,brockwhittaker/zulip,zulip/zulip,synicalsyntax/zulip,rht/zulip,mahim97/zulip,shubhamdhama/zulip,showell/zulip,showell/zulip,brainwane/zulip,shubhamdhama/zulip,eeshangarg/zulip,jackrzhang/zulip,andersk/zulip,punchagan/zulip,brockwhittaker/zulip,rht/zulip,punchagan/zulip,zulip/zulip,hackerkid/zulip,timabbott/zulip,mahim97/zulip,andersk/zulip