Deprecate gitcoin.co/livestream and use /events to show AddEvent calendar

### User Story

[comment]: # gitcoin.co/livestream is no longer being used and we would like an easy way to direct people to the event calendar.

### Why Is this Needed

[comment]: # Now that we use Addevent we need one place where the add event information lives.
*Summary*:

### Description: the link for Addevent is here: https://www.addevent.com/calendars/Jm347515 I can also provide Add Event API if needed.

[comment]: # (Feature or Bug? i.e Type: Bug)
*Type*: enhancement

### Current Behavior
[comment]: # User should be able to go to gitcoin.co/event and see the addevent calendars.

### Expected Behavior
[comment]: # (Describe what you expected to happen.)

### Definition of Done
[comment]: # (Any other information that would be useful, bullets are helpful.)

### Data Requirements
[comment]: # (How will we measure the success of this feature? What kind of tracking is needed for this feature (clicks, impressions, flag)?)

### Additional Information
[comment]: # (Any other information that would be useful, content, screenshots, etc.)