Use BootTidal.hs from Tidal source repository by default

[munshkr]

BootTidal.hs is the bootloading script of TidalCycles, and it used to be included together in each editor plugin. Now it is possible to get the source code repository of the TidalCycles installed by doing:

ghc-pkg field tidal data-dir --simple-output

So vim-tidal could use the corresponding bootloading script.
Doing this would allow us to ditch Tidal.ghci from this repository.