Update setup.py to include package data

setup.py

@@ -13,6 +13,8 @@ setup(
     long_description_content_type="text/markdown",
     url="https://gitlab.eox.at/esa/prism/vs/-/tree/master/harvester",
     packages=find_packages(),
+    package_data={'': ['templates/*']},
+    include_package_data=True
     classifiers=[
         "Programming Language :: Python :: 3",
         "License :: OSI Approved :: MIT License",