Update REFERENCE.md with links to main docs, alphabetize list

docs/REFERENCE.md

@@ -2,24 +2,25 @@
 ℹ️ Find documentation for the following connector clients in the Elastic Enterprise Search docs:
 
 - [Azure Blob Storage](https://www.elastic.co/guide/en/enterprise-search/master/connectors-azure-blob.html)
+- [Box](https://www.elastic.co/guide/en/enterprise-search/master/connectors-box.html)
 - [Confluence](https://www.elastic.co/guide/en/enterprise-search/master/connectors-confluence.html)
 - [Dropbox](https://www.elastic.co/guide/en/enterprise-search/master/connectors-dropbox.html)
+- [GitHub](https://www.elastic.co/guide/en/enterprise-search/master/connectors-github.html)
 - [Google Cloud Storage](https://www.elastic.co/guide/en/enterprise-search/master/connectors-google-cloud.html)
 - [Google Drive](https://www.elastic.co/guide/en/enterprise-search/master/connectors-google-drive.html)
 - [Jira](https://www.elastic.co/guide/en/enterprise-search/master/connectors-jira.html)
 - [Microsoft SQL](https://www.elastic.co/guide/en/enterprise-search/master/connectors-ms-sql.html)
+- [Microsoft Teams](https://www.elastic.co/guide/en/enterprise-search/master/connectors-teams.html)
 - [MongoDB](https://www.elastic.co/guide/en/enterprise-search/master/connectors-mongodb.html)
 - [MySQL](https://www.elastic.co/guide/en/enterprise-search/master/connectors-mysql.html)
 - [Network drive](https://www.elastic.co/guide/en/enterprise-search/master/connectors-network-drive.html)
+- [OneDrive](https://www.elastic.co/guide/en/enterprise-search/master/connectors-onedrive.html)
 - [Oracle](https://www.elastic.co/guide/en/enterprise-search/master/connectors-oracle.html)
+- [Outlook](https://www.elastic.co/guide/en/enterprise-search/master/connectors-outlook.html)
 - [PostgreSQL](https://www.elastic.co/guide/en/enterprise-search/master/connectors-postgresql.html)
 - [S3](https://www.elastic.co/guide/en/enterprise-search/master/connectors-s3.html)
 - [ServiceNow](https://www.elastic.co/guide/en/enterprise-search/master/connectors-servicenow.html)
 - [SharePoint Online](https://www.elastic.co/guide/en/enterprise-search/master/connectors-sharepoint-online.html)
 - [SharePoint Server](https://www.elastic.co/guide/en/enterprise-search/master/connectors-sharepoint.html)
-- [GitHub](./reference/github.md)
-- [OneDrive](./reference/onedrive.md)
-- [Outlook](./reference/outlook.md)
-- [Zoom](./reference/zoom.md)
-- [Microsoft Teams](./reference/microsoft_teams.md)
-- [Box](./reference/box.md)
+- [Zoom](https://www.elastic.co/guide/en/enterprise-search/master/connectors-zoom.html)
+