[xq] Change all URLs to shorthand

• XQuery: […]/edoc/addin/wdm-toolbox/(.*) → /(\d)/a/wdm-toolbox/$1
• Blobs:
  • […]/edoc/addin/wdm-toolbox/(.*) → /(\d)/g/wdm-toolbox/$1
  • […]/edoc/data/(.*) → /(\d)/g/$1
• /exist/restxq/edoc/(.*) → /(\d)/r/$1

Necessary to address #19 (closed) #20 #21

Requires zeid/wdbplus-ulb#32