Problem: filetype: lf config files are not recognized
Solution: detect lfrc files as lf filetype, include a syntax
script for lf files (Andis Spriņķis).
References:
- https://github.com/gokcehan/lfcloses: vim/vim#158590f146b7925
Co-authored-by: Andis Spriņķis <spr.andis@protonmail.com>