remove slackin
remove slackin

Since it doesn't work with our use case.
Closes #9.

evangelistcollective/evangelistcollective.github.io,mjbrender/evangelistcollective.github.io,mjbrender/evangelistcollective.github.io,evangelistcollective/evangelistcollective.github.io,evangelistcollective/evangelistcollective.github.io,evangelistcollective/evangelistcollective.github.io,mjbrender/evangelistcollective.github.io,mjbrender/evangelistcollective.github.io