fix(ci): Improve Continuous Improvement Docs

[kenzoengineer]

todo:

• going to try to add more info because we removed some elements from this page

DESCRIBE YOUR PR

Some information regarding continuous integration wasn't precise enough.

• I've added some more specificity regarding what we actually do in our CI process
• We already mention the fast revert method in the Workflow page, so I removed it from this page
• Moved the deployment block to the bottom, if we have more public info I may move it to a different page

IS YOUR CHANGE URGENT?

Help us prioritize incoming PRs by letting us know when the change needs to go live.

• [ ] Urgent deadline (GA date, etc.):
• [ ] Other deadline:
• [x] 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:

• [ ] Checked Vercel preview for correctness, including links
• [ ] PR was reviewed and approved by any necessary SMEs (subject matter experts)
• [ ] PR was reviewed and approved by a member of the Sentry docs team

EXTRA RESOURCES

• Sentry Docs contributor guide