Updating project documentation

[douglowe]

A list of out of date information I've found while working on the wiki:

• Maintainer meeting schedule needs updating (Wednesday->Tuesday): https://github.com/carpentries-incubator/python-intermediate-development/blob/main/GOVERNANCE.md#meeting-schedule
• Contribution email is the central Carpentries email - do we want to change this? https://github.com/carpentries-incubator/python-intermediate-development/blob/main/CONTRIBUTING.md#how-to-contribute
• Link for creating a new issue points to https://example.com/FIXME/issues. Should we change this to a link to create an issue on our repo? https://github.com/carpentries-incubator/python-intermediate-development/blob/main/CONTRIBUTING.md#how-to-contribute
• Link for issues in our repository also points to same FIXME link. We should correct this. https://github.com/carpentries-incubator/python-intermediate-development/blob/main/CONTRIBUTING.md#what-to-contribute
• Link for upstream repository needs to be fixed. https://github.com/carpentries-incubator/python-intermediate-development/blob/main/CONTRIBUTING.md#using-github
• Need to update note on lead maintainer, and current maintainers, and change meeting schedule here. https://github.com/carpentries-incubator/python-intermediate-development/blob/main/README.md#maintainers