Unable to join Slack to ask some questions about contributing

[nburns]

Description
the slack link is broken in the CONTRIBUTING.rst file: https://github.com/newrelic/newrelic-python-agent/blob/main/CONTRIBUTING.rst#slack

Expected Behavior
I'd be able to join a slack and ask some questions about work related to #952

Steps to Reproduce
visit the link in the description above and click the slack link

Your Environment
safari

Additional context
trying to run the tests in the devcontainer does not work, and I'm wondering if I'm missing some setup instructions:

> docker exec -it --workdir /workspaces/newrelic-python-agent 35a3a60c14cd /bin/bash

vscode@linuxkit-66f0adc78c76:/workspaces/newrelic-python-agent/tests$ tox -c tox.ini -e datastore_aiomysql
/home/vscode/.pyenv/shims/tox: line 8: /root/.pyenv/libexec/pyenv: Permission denied

[TimPansino]

That workspace looks like it's been deleted, I'm not sure why it's gone.

As far as the devcontainer goes, looks like the permissions issue wasn't fixed all the way. I'll fix that.