[oni-core] Add settings for tree-sitter

- Set the ‘treesit-extra-load-path’ to the value of ‘TREE_SITTER_GRAMMAR_PATH’.
  Emacs doesn't seem to do this automatically, but Guix sets that variable when
  grammars get installed.

- Add ‘bash-ts-mode’ to the ‘interpreter-mode-alist’. In his article[1] about
  tree sitter support in Emacs Mickey Petersen mentions that it's best to use
  ‘major-mode-remap-alist’, however in his example he remaps ‘bash-mode’ to
  ‘bash-ts-mode’, but there is no ‘bash-mode’. Setting the
  ‘interpreter-mode-alist’ like this still works.

[1]: https://www.masteringemacs.org/article/how-to-get-started-tree-sitter

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