fix: replace README.rst with docs/README.md in config files

Author: Lee-W

Diff for: MANIFEST.in

@@ -1,5 +1,4 @@
 include .bumpversion.cfg
-include README.rst
 include LICENSE
 include commitizen/cz/*.txt
 global-exclude *.py[cod] __pycache__ *.so *.dylib

Diff for: pyproject.toml

@@ -34,7 +34,7 @@ description = "Python commitizen client tool"
 authors = ["Santiago Fraire <[email protected]>"]
 license = "MIT"
 keywords = ["commitizen", "conventional", "commits", "git"]
-readme = "README.rst"
+readme = "docs/README.md"
 homepage = "https://github.com/woile/commitizen"
 classifiers = [
     "License :: OSI Approved :: MIT License",