Change anchor to button element (#3321)

Fix warning for ESLint (jsx-a11y/href-no-hash).

app/javascript/styles/components.scss

@@ -1965,9 +1965,14 @@ button.icon-button.active i.fa-retweet {
 .load-more {
   display: block;
   color: lighten($ui-base-color, 26%);
+  background-color: transparent;
+  border: 0;
+  font-size: inherit;
   text-align: center;
+  line-height: inherit;
+  margin: 0;
   padding: 15px;
-  text-decoration: none;
+  width: 100%;
   clear: both;
 
   &:hover {
@@ -2916,11 +2921,15 @@ button.icon-button.active i.fa-retweet {
     min-width: 33px;
   }
 
-  a {
+  .onboarding-modal__nav {
     color: darken($ui-secondary-color, 34%);
-    text-decoration: none;
+    background-color: transparent;
+    border: 0;
     font-size: 14px;
     font-weight: 500;
+    padding: 0;
+    line-height: inherit;
+    height: auto;
 
     &:hover,
     &:focus,