Tidy up README
Tidy up README

Adds ToC, minor grammar improvements, web link improvements
as GitHub does not support ircs:// in markdown

DarthGandalf/znc,Zarthus/znc,GLolol/znc,psychon/znc,dgw/znc,DarthGandalf/znc,Zarthus/znc,dgw/znc,BtbN/znc,dgw/znc,znc/znc,znc/znc,DarthGandalf/znc,znc/znc,dgw/znc,DarthGandalf/znc,elyscape/znc,psychon/znc,GLolol/znc,Zarthus/znc,markusj/znc,dgw/znc,BtbN/znc,elyscape/znc,markusj/znc,Zarthus/znc,markusj/znc,markusj/znc,elyscape/znc,DarthGandalf/znc,znc/znc,znc/znc,psychon/znc,BtbN/znc,elyscape/znc,elyscape/znc,markusj/znc,GLolol/znc,psychon/znc,BtbN/znc,BtbN/znc,GLolol/znc,psychon/znc,dgw/znc,Zarthus/znc,Zarthus/znc,DarthGandalf/znc,markusj/znc,GLolol/znc,psychon/znc,GLolol/znc,elyscape/znc,BtbN/znc,znc/znc