docs: Update production git branches to main programmatically (#969)

[drstrangelooker]

• Adding a script to programmatically update Looker projects to use main as their default branch

Co-authored-by: Joel Dodge [email protected] Co-authored-by: Dr. Strangelove [email protected]

[drstrangelooker]

Local version of https://github.com/looker-open-source/sdk-codegen/pull/969

[lanlooker]

@eric-lyons let me know there is a typo in the README.md (https://github.com/looker-open-source/sdk-codegen/tree/main/examples/python)

there is no whitespace here

@drstrangelooker, can you please make the change and include that in this PR? Thank you

[drstrangelooker]

Edited Whitespace. Once we get an approving review we can merge.