Support keyboard shortcuts for nav + add

[gokulkrishh]

It would be lot easier to navigate in desktop if we support keyboard shortcuts like

Eg:

opt + o = overview
opt + s = subscriptions
opt + i = income
opt + e = expenses
opt + in = investments
opt + a = open add

All optionally shortcut could be 

opt + f = feedback
opt + c = range calendar
opt + md = select month to date in range
opt + yd = select month to date in range
opt + l7 = select last 7 days
opt + t = select today

[gokulkrishh]

Should i use https://www.radix-ui.com/docs/primitives/components/tooltip for tooltip?

[gokulkrishh]

via #34