fix: update docs and workflow for default main branch

[dongsam]

closes: #73

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Before we can merge this PR, please make sure that all the following items have been
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• Appropriate labels applied
• Targeted PR against correct branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[jaybxyz]

I look through all with the master and main keywords and LGTM.

[barriebyron]

I'm so proud of you all for many reasons, but omitting language that is not inclusive is a huge global step into being more awesome. Thank you!!