Allow merging of external PRs

[lorensr]

Issue

This PR:

https://github.com/temporalio/documentation/pull/1519

was replaced with this one:

https://github.com/temporalio/documentation/pull/1520

due to Netlify being part of CI and requiring the PR creator to have a Netlify seat on Temporal's team.

Solution

Ideally in an OSS project, we're able to merge community contributions. A couple ideas:

• Change Netlify setup so that it doesn't require PR creator to be a user (I haven't looked into this—maybe a Netlify setting, or using a GH Action yaml file instead of Netlify's Action?)
• Make Netlify not a required CI step.