Rename pages, away from all having 'metadata', to be more correct

config.js

@@ -70,11 +70,11 @@ module.exports = {
     },
     {
       from: '/concepts/oeps-did/',
-      to: '/concepts/metadata-did/'
+      to: '/concepts/did-ddo/'
     },
     {
       from: '/concepts/oeps-asset-ddo/',
-      to: '/concepts/metadata-asset-ddo/'
+      to: '/concepts/ddo-metadata/'
     }
   ],
   swaggerComponents: [

content/concepts/ddo-metadata.md

@@ -1,7 +1,7 @@
 ---
 title: DDO Metadata
 description: Specification of metadata schema. Each Ocean asset DDO includes metadata.
-slug: /concepts/metadata-asset-ddo/
+slug: /concepts/ddo-metadata/
 section: concepts
 ---
 

content/concepts/did-ddo.md

@@ -1,7 +1,7 @@
 ---
 title: DIDs & DDOs - Asset Identifiers & Objects
 description: Specification of DIDs & DDOs in Ocean
-slug: /concepts/metadata-did/
+slug: /concepts/did-ddo/
 section: concepts
 ---
 

data/sidebars/concepts.yml

@@ -21,9 +21,9 @@
 - group: Specifying Assets
   items:
     - title: DIDs & DDOs
-      link: /concepts/metadata-did/
+      link: /concepts/did-ddo/
     - title: DDO Metadata
-      link: /concepts/metadata-asset-ddo/
+      link: /concepts/ddo-metadata/
 
 - group: Contribute
   items: