Link guides back to the Fatiando-wide pages (#338)

Our CoC and Authorship, Contributing, and Maintainers Guides don't need
to be repeated here since they are already in the fatiando/community
repository. Remove the Authorship and Maintainers documents. Replace the
content in CoC and Contributing documents with links to the organization
wide documents.

CODE_OF_CONDUCT.md

@@ -1,77 +1,4 @@
 # Contributor Code of Conduct
 
-## Our Pledge
-
-In the interest of fostering an open and welcoming environment, we as
-contributors and maintainers pledge to making participation in our project and
-our community a harassment-free experience for everyone, regardless of age,
-body size, disability, ethnicity, gender identity and expression, level of
-experience, nationality, personal appearance, race, religion, or sexual
-identity and orientation.
-
-## Our Standards
-
-Examples of behavior that contributes to creating a positive environment
-include:
-
-* Using welcoming and inclusive language
-* Being respectful of differing viewpoints and experiences
-* Gracefully accepting constructive criticism
-* Focusing on what is best for the community
-* Showing empathy towards other community members
-
-Examples of unacceptable behavior by participants include:
-
-* The use of sexualized language or imagery and unwelcome sexual attention or
-  advances
-* Trolling, insulting/derogatory comments, and personal or political attacks
-* Public or private harassment
-* Publishing others' private information, such as a physical or electronic
-  address, without explicit permission
-* Other conduct which could reasonably be considered inappropriate in a
-  professional setting
-
-## Our Responsibilities
-
-Project maintainers are responsible for clarifying the standards of acceptable
-behavior and are expected to take appropriate and fair corrective action in
-response to any instances of unacceptable behavior.
-
-Project maintainers have the right and responsibility to remove, edit, or
-reject comments, commits, code, wiki edits, issues, and other contributions
-that are not aligned to this Code of Conduct, or to ban temporarily or
-permanently any contributor for other behaviors that they deem inappropriate,
-threatening, offensive, or harmful.
-
-## Scope
-
-This Code of Conduct applies both within project spaces and in public spaces
-when an individual is representing the project or its community. Examples of
-representing a project or community include using an official project e-mail
-address, posting via an official social media account, or acting as an
-appointed representative at an online or offline event. Representation of a
-project may be further defined and clarified by project maintainers.
-
-## Enforcement
-
-Instances of abusive, harassing, or otherwise unacceptable behavior may be
-reported by contacting [Leonardo Uieda](http://www.leouieda.com).
-
-All complaints will be reviewed and investigated and will result in a response
-that is deemed necessary and appropriate to the circumstances. The project team
-is obligated to maintain confidentiality with regard to the reporter of an
-incident.  Further details of specific enforcement policies may be posted
-separately.
-
-Project maintainers who do not follow or enforce the Code of Conduct in good
-faith may face temporary or permanent repercussions as determined by other
-members of the project's leadership.
-
-## Attribution
-
-This Code of Conduct is adapted from the [Contributor Covenant][homepage],
-version 1.4, available at
-[http://contributor-covenant.org/version/1/4][version]
-
-[homepage]: http://contributor-covenant.org
-[version]: http://contributor-covenant.org/version/1/4/
+Please refer to our organization-wide
+[Code of Conduct](https://github.com/fatiando/community/blob/main/CODE_OF_CONDUCT.md).