Order of arguments in docs sidebar

[bdpedigo]

I suggest the sidebar docs should go:

• Install
• Tutorials
• Reference (maybe this could be swapped with tutorial?)
• Everything else

discussed this with @daxpryce - the way the docs are setup currently with the split between tutorial/reference, this simple reordering would be difficult to implement. lets look into it at some point in the future

[rajpratyush]

shall i work on this issue ?