hugo: fix cachebuster regexp

Cachebusters previously failed to detect changes in asset/layout files
due to a bad regex. Also simplified patterns by removing unnecessary
escapes and quotations.

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>

hugo.yaml

@@ -39,14 +39,14 @@ related:
 build:
   writeStats: true
   cachebusters:
-    - source: "assets/watching/hugo_stats\\.json"
+    - source: assets/watching/hugo_stats\.json
-      target: "styles\\.css"
+      target: styles\.css
-    - source: "(postcss|tailwind)\\.config\\.js"
+    - source: (postcss|tailwind)\.config\.js
-      target: "css"
+      target: css
-    - source: "assets/.*\\.(js|ts|jsx|tsx)"
+    - source: assets/.*\.js
-      target: "js"
+      target: js
-    - source: "(assets|layouts)/.*\\.(.*)$"
+    - source: (assets|layouts)/.*\.(.*)$
-      target: "$1"
+      target: "$2"
 
 outputFormats:
   redirects: