fixed grammatical errors

Author: amanda-tan

_config.yml

@@ -10,7 +10,7 @@ description: Data Science + Oceanography<br>
 
 # Banner button to lead to form, then schedule, then next year's website.
 banner_button_url: https://columbiauniversity.zoom.us/j/318805257
-banner_button_text: Joint remotely during the event (via Zoom)!
+banner_button_text: Join remotely during the event (via Zoom)!
 
 
 baseurl: "" # the subpath of your site, e.g. /blog