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/Cron.vue

@@ -66,17 +66,19 @@ onMounted(() => {
       <fieldset :disabled="busy || app.error">
         <input style="display: none;" type="submit" />
 
-        <label for="crontabInput" style="display: flex; justify-content: space-between;">
-          <span>{{ $t('app.cron.title') }} <sup><a href="https://docs.cloudron.io/apps/#cron" class="help" target="_blank"><i class="fa fa-question-circle"></i></a></sup></span>
-          <Button small outline :menu="commonPatternsMenu">{{ $t('app.cron.addCommonPattern') }}</Button>
-        </label>
+        <FormGroup>
+          <label for="crontabInput" style="display: flex; justify-content: space-between;">
+            <span>{{ $t('app.cron.title') }} <sup><a href="https://docs.cloudron.io/apps/#cron" class="help" target="_blank"><i class="fa fa-question-circle"></i></a></sup></span>
+            <Button small outline :menu="commonPatternsMenu">{{ $t('app.cron.addCommonPattern') }}</Button>
+          </label>
 
-        <div>{{ $t('app.cron.description') }}</div>
+          <div>{{ $t('app.cron.description') }}</div>
 
-        <textarea id="crontabInput" style="width: 100%; white-space: pre-wrap; font-family: monospace;" v-model="crontab" rows="10"></textarea>
-
-        <Button @click="onSubmit()" :loading="busy" :disabled="busy">{{ $t('app.cron.saveAction') }}</Button>
+          <textarea id="crontabInput" style="width: 100%; white-space: pre-wrap; font-family: monospace;" v-model="crontab" rows="10"></textarea>
+        </FormGroup>
       </fieldset>
     </form>
+    <br/>
+    <Button @click="onSubmit()" :loading="busy" :disabled="busy">{{ $t('app.cron.saveAction') }}</Button>
   </div>
 </template>

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>