Switch to EditorConfig from Vim modelines

- Filetype detection occurs automatically after changing the AsciiDoc
  filetype to .adoc from .txt.

- `"let b:current_syntax = 'PKGBUILD'` appears to have no effect.

Signed-off-by: Daniel M. Capella <polyzen@archlinux.org>
1 job for !9 with editorconfig in 15 seconds
latest merge request