Spacing fixes in forms

form - helps with capturing the submit top level. no styling
fieldset - helps with disabling elements in single place. no styling.
   in html, this does have a default border which we remove in style.css.

FormGroup - pankow element. This defines the spacing between adjacent
   FormGroups as 6px.

dashboard/src/components/app/Display.vue

@@ -107,9 +107,9 @@ onMounted(() => {
           <TagInput id="tagsInput" :placeholder="$t('app.display.tagsPlaceholder')" v-model="tags" v-tooltip="$t('app.display.tagsTooltip')"/>
           <div class="text-error" v-if="tagsError">{{ tagsError }}</div>
         </FormGroup>
-
-        <Button @click="onSubmit()" :loading="busy" :disabled="busy || !haveValuesChanged">{{ $t('app.display.saveAction') }}</Button>
       </fieldset>
     </form>
+    <br/>
+    <Button @click="onSubmit()" :loading="busy" :disabled="busy || !haveValuesChanged">{{ $t('app.display.saveAction') }}</Button>
   </div>
 </template>