feat: previewing .qmd files just like .md

lua/plugins/peek.lua

@@ -18,7 +18,7 @@ return {
             app = 'browser', -- 'webview', 'browser', string or a table of strings
             -- explained below
 
-            filetype = { 'markdown' }, -- list of filetypes to recognize as markdown
+            filetype = { 'markdown', 'quarto' }, -- list of filetypes to recognize as markdown
 
             -- relevant if update_on_change is true
             throttle_at = 200000,   -- start throttling when file exceeds this