Update trace explorer doc for GA (#13560)

## DESCRIBE YOUR PR
Updating trace explorer doc for GA - adding arcades, new screenshots,
and a few text tweaks

Deleting old trace explorer docs. 

closes #13539 

## IS YOUR CHANGE URGENT?  

Help us prioritize incoming PRs by letting us know when the change needs
to go live.
- [x] Urgent deadline (GA date, etc.): First week of May
- [ ] Other deadline: <!-- ENTER DATE HERE -->
- [ ] None: Not urgent, can wait up to 1 week+

## SLA

- Teamwork makes the dream work, so please add a reviewer to your PRs.
- Please give the docs team up to 1 week to review your PR unless you've
added an urgent due date to it.
Thanks in advance for your help!

## PRE-MERGE CHECKLIST

*Make sure you've checked the following before merging your changes:*

- [ x] Checked Vercel preview for correctness, including links
- [x ] PR was reviewed and approved by any necessary SMEs (subject matter
experts)
- [x ] PR was reviewed and approved by a member of the [Sentry docs
team](https://github.com/orgs/getsentry/teams/docs)

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Co-authored-by: Shannon Anahata <[email protected]>

Author: sfanahata