Fix setup.cfg package discovery and README format

Signed-off-by: anish-devgit <xtylishanish@gmail.com>

Author: anish-devgit

setup.cfg

@@ -5,8 +5,8 @@ license = Apache-2.0
 
 # description must be on ONE line https://github.com/pypa/setuptools/issues/1390
 description = aboutcode
-long_description = file:README.rst
-long_description_content_type = text/x-rst
+long_description = file:README.md
+long_description_content_type = text/markdown
 url = https://github.com/aboutcode-org/aboutcode
 
 author = nexB. Inc. and others
@@ -31,9 +31,17 @@ license_files =
 zip_safe = false
 setup_requires = setuptools_scm[toml] >= 4
 python_requires = >=3.10
+packages = find:
 install_requires =
 
 
+[options.packages.find]
+where = .
+exclude =
+    automation
+    designs
+    docs
+
 [options.extras_require]
 docs =
     Sphinx