Replace CodeHarbourLink .erb wtih .slim templates

- this is consistent with the remaining view architecture

(leoselig/codeocean#2)

app/views/code_harbor_links/index.html.slim

@@ -0,0 +1,18 @@
+h1 = CodeHarborLink.model_name.human(count: 2)
+
+.table-responsive
+  table.table
+    thead
+      tr
+        th = t('activerecord.attributes.code_harbor_link.oauth2token')
+        th colspan=3 = t('shared.actions')
+    tbody
+      - @code_harbor_links.each do |code_harbor_link|
+        tr
+          td = code_harbor_link.oauth2token
+          td = link_to(t('shared.show'), code_harbor_link)
+          td = link_to(t('shared.edit'), edit_code_harbor_link_path(code_harbor_link))
+          td = link_to(t('shared.destroy'), code_harbor_link, data: {confirm: t('shared.confirm_destroy')}, method: :delete)
+
+= render('shared/pagination', collection: @code_harbor_links)
+p = render('shared/new_button', model: CodeHarborLink)