Merge pull request #846 from alphagov/add-manual-slug

Add manual slug for `economic-crime-levy`

Author: gclssvglx

config/initializers/known_manual_slugs.rb

@@ -55,6 +55,7 @@
   ec-export-preferences
   ec-preferences-exports-turkey
   ec-preferences-imports-turkey
+  economic-crime-levy
   economic-crime-supervision-handbook
   electricity-generator-levy-manual
   employee-tax-advantaged-share-scheme-user-manual