feat: add QLever as SPARQL server type

Author: rogargon

src/app/dataset/dataset-form/dataset-form.component.html

@@ -63,6 +63,7 @@
               <option [value]="'MARKLOGIC'">MarkLogic</option>
               <option [value]="'STARDOG'">Stardog</option>
               <option [value]="'VIRTUOSO'">Virtuoso</option>
+              <option [value]="'QLEVER'">QLever</option>
             </select>
           </div>
 

src/environments/environment.ts

@@ -4,8 +4,7 @@
 
 export const environment = {
   production: false,
-  API: 'https://rhizomer-api.dev.rhizomik.net'
-  //API: 'http://localhost:8080'
+  API: 'http://localhost:8080'
 };
 
 /*