chore: master -> main

[alexanderbez]

Description

Update all references of master to main, including CI workflows, docs, guides, etc...I'm sure I missed some old docs, but we can update those as we find them in the future. Important part is that we got CI and actions covered.

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Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[tac0turtle]

this will break existing links, we should look into redirecting

[alexanderbez]

Can you explain a bit? Shouldn't links still work as we just renamed the default branch?

[tac0turtle]

https://docs.cosmos.network/master/ the url here would change from master to main, it may invalidate urls and links in other repos

[julienrbrt]

It does not seem that these redirects are working tho: https://github.com/cosmos/cosmos-sdk/blob/main/docs/.vuepress/enhanceApp.js

[julienrbrt]

This PR cannot be merged to this test failing: https://github.com/cosmos/cosmos-sdk/runs/6133701530?check_suite_focus=true
But to fix this test, we need this PR merged 😅

This is blocking some other PR btw.

[tac0turtle]

@alexanderbez feel free to admin merge when you think its ready

[alexanderbez]

Merged! 🚀