Fix typo in the Contributing section of README and index.md files (#4)

README.md

@@ -80,7 +80,7 @@ This mod uses the credentials configured in the [Steampipe Mastodon  plugin](htt
 
 If you have an idea for additional dashboards or just want to help maintain and extend this mod ([or others](https://github.com/topics/steampipe-mod)) we would love you to join the community and start contributing.
 
-- **[Join #steampipe on Slack → →](https://turbot.com/community/join)** and hang out with other Mod developers.
+- **[Join #steampipe on Slack →](https://turbot.com/community/join)** and hang out with other Mod developers.
 
 Please see the [contribution guidelines](https://github.com/turbot/steampipe/blob/main/CONTRIBUTING.md) and our [code of conduct](https://github.com/turbot/steampipe/blob/main/CODE_OF_CONDUCT.md). All contributions are subject to the [Apache 2.0 open source license](https://github.com/turbot/steampipe-mod-digitalocean-insights/blob/main/LICENSE).