DOC: update Readme recommended tags for new contributors (pandas-dev#20992)

* DOC: Change recommended tag for new contributors in main README.md (pandas-dev#20982)

* DOC: Change recommended tag for new contributors in docs (pandas-dev#20982)

Author: mvinoba

README.md

@@ -233,7 +233,7 @@ All contributions, bug reports, bug fixes, documentation improvements, enhanceme
 
 A detailed overview on how to contribute can be found in the **[contributing guide.](https://pandas.pydata.org/pandas-docs/stable/contributing.html)**
 
-If you are simply looking to start working with the pandas codebase, navigate to the [GitHub “issues” tab](https://github.com/pandas-dev/pandas/issues) and start looking through interesting issues. There are a number of issues listed under [Docs](https://github.com/pandas-dev/pandas/issues?labels=Docs&sort=updated&state=open) and [Difficulty Novice](https://github.com/pandas-dev/pandas/issues?q=is%3Aopen+is%3Aissue+label%3A%22Difficulty+Novice%22) where you could start out.
+If you are simply looking to start working with the pandas codebase, navigate to the [GitHub “issues” tab](https://github.com/pandas-dev/pandas/issues) and start looking through interesting issues. There are a number of issues listed under [Docs](https://github.com/pandas-dev/pandas/issues?labels=Docs&sort=updated&state=open) and [good first issue](https://github.com/pandas-dev/pandas/issues?labels=good+first+issue&sort=updated&state=open) where you could start out.
 
 You can also triage issues which may include reproducing bug reports, or asking for vital information such as version numbers or reproduction instructions. If you would like to start triaging issues, one easy way to get started is to [subscribe to pandas on CodeTriage](https://www.codetriage.com/pandas-dev/pandas).
 

doc/source/contributing.rst

@@ -17,8 +17,8 @@ If you are brand new to pandas or open-source development, we recommend going
 through the `GitHub "issues" tab <https://github.com/pandas-dev/pandas/issues>`_
 to find issues that interest you. There are a number of issues listed under `Docs
 <https://github.com/pandas-dev/pandas/issues?labels=Docs&sort=updated&state=open>`_
-and `Difficulty Novice
-<https://github.com/pandas-dev/pandas/issues?q=is%3Aopen+is%3Aissue+label%3A%22Difficulty+Novice%22>`_
+and `good first issue
+<https://github.com/pandas-dev/pandas/issues?labels=good+first+issue&sort=updated&state=open>`_
 where you could start out. Once you've found an interesting issue, you can
 return here to get your development environment setup.