Change pre-commit hook to run on specific files only (#840)

The pre-commit hook should run only on jl, md, jmq, and qmd
files, since it only modifies those files.

Co-authored-by: Dominique Luna <dluna132@gmail.com>

.pre-commit-hooks.yaml

@@ -2,6 +2,8 @@
   name: "Julia Formatter"
   entry: "julia -e 'import JuliaFormatter: format; format(\".\")'"
   pass_filenames: false
-  always_run: true
+  always_run: false
+  types: [file]
+  files: \.(jl|[jq]?md)$
   language: "system"
-  description: "An opinionated code formatter for Julia. Plot twist - the opinion is your own."
+  description: "An opinionated code formatter for Julia. Plot twist - the opinion is your own."