Leave video conferencing platform unspecified

Replace the reference to Zoom for weekly meetings with the generic mention of video conferencing.

Author: pamoroso

content/en/project/getInvolved/_index.md

@@ -50,7 +50,7 @@ The archives are public. The LispCore group gets much more email, and posts from
 * X (Twitter) handle: [interlisp8](https://twitter.com/interlisp8).
 * _Direct email:_ In addition to the email groups listed above, you can email us at [[email protected]](mailto:[email protected]).
 
-## 4. Weekly meetings. We have weekly meetings on Zoom:
+## 4. Weekly meetings. We have weekly video conferencing meetings:
 
 Mondays:    2pm PT/5pm ET. Implementation -- technical discussions  
 Wednesdays: 10am PT/1pm ET. Communication -- website, talks,