[TechDocs] Rebuild docs if the github source is newer than last docs build (#2353)

* Added age check for documentation in github to make sure it's up to date

* Updated failing tests

* Updated docs to explain requestUrl and storageUrl

* Updated failing tests

* Update packages/create-app/templates/default-app/app-config.yaml.hbs

* Update docs/features/techdocs/getting-started.md

Co-authored-by: Emma Indal <emmai@spotify.com>

plugins/techdocs/src/plugin.ts

@@ -60,7 +60,7 @@ export const plugin = createPlugin({
       deps: { configApi: configApiRef },
       factory: ({ configApi }) =>
         new TechDocsStorageApi({
-          apiOrigin: configApi.getString('techdocs.storageUrl'),
+          apiOrigin: configApi.getString('techdocs.requestUrl'),
         }),
     }),
   ],