TUL/Reduce the footer vendor credit to the company name (#1466)

The footer credit read "Theme by" stacked above "+ dataquest". Drop the
wording and leave the company name on its own.

The wording was hard-coded in the template here, not translated, so there
is no i18n key to remove. The .theme-by SCSS rule is deleted along with the
element it styled.

Refs dataquest-dev/dspace-customers#592

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

Author: MatusBeke

src/app/footer/footer.component.html

@@ -90,7 +90,6 @@ <h5 class="text-uppercase">Footer Content</h5>
               </ul>
             </div>
             <div class="footer-sign">
-              <p class="theme-by">Theme by</p>
               <a class="dtq-sign text-white"
                  [href]="(themedByUrl$ | async)?.payload?.values[0]"
                  [title]="(themedByCompanyName$ | async)?.payload?.values[0]">

src/app/footer/footer.component.scss

@@ -42,10 +42,6 @@
       }
     }
   }
-  .theme-by {
-    padding-top: 4px;
-    font-size: 12px !important;
-  }
 }