change docs builds to mamba

[jthorton]

Description

Provide a brief description of the PR's purpose here.

Todos

Notable points that this PR has either accomplished or will accomplish.

• [ ] TODO 1

Questions

• [ ] Question1

Status

• [ ] Ready to go

[codecov[bot]]

Codecov Report

Merging #170 (252417b) into master (da19521) will decrease coverage by 0.08%. The diff coverage is n/a.