Remove README from docs exclude patterns as it does not help

[btjanaka]

Description

We keep getting warnings like:

...../docs/tutorials/README.md: WARNING: document isn't included in any toctree

because README.md is in docs/tutorials due to symlinking but we do not want it in the documentation. We tried to change this in #316 but the warning still shows up. Since it does not break the build, we will leave this warning as is.

TODO

Questions

Status

• [x] I have read the guidelines in CONTRIBUTING.md
• [x] I have formatted my code using yapf
• [x] I have tested my code by running pytest
• [x] I have linted my code with pylint
• [ ] ~I have added a one-line description of my change to the changelog in HISTORY.md~
• [x] This PR is ready to go