Updating Helm settings and adding new bindings

Added helm-mode to `use-package` idle timer to load when idle instead of just defer.

"SPC s" Bindings ("s" prefix signifies showing buffer data)
- sy = yank / kill ring
- sm = mark ring
- sr = registers

"SPC f" Bindings ("f" prefix signifies file activies)
- fh = helm-find-files

"SPC F1" is `helm-apropos`
Keep it to have it enabled right when it is first used. Otherwise we have to wait withtout doing nothing to enable the mode. Watch for the "Helm completion enabled" in message buffer. It appears only if you let the idle timer activate the mode, using `<SPC> b s` does not activate it (even though the command works).