chore: Remove static URLs from the documentation (#5461)

app/javascript/dashboard/helper/portalHelper.js

@@ -0,0 +1,10 @@
+export const buildPortalURL = portalSlug => {
+  const { hostURL, helpCenterURL } = window.chatwootConfig;
+  const baseURL = helpCenterURL || hostURL || '';
+  return `${baseURL}/hc/${portalSlug}`;
+};
+
+export const buildPortalArticleURL = (portalSlug, categorySlug, articleId) => {
+  const portalURL = buildPortalURL(portalSlug);
+  return `${portalURL}/${categorySlug}/${articleId}`;
+};