v1.0.0

• Tested thoroughly the OVERLEAF COOKIE expiration hypothesis. (Details can be found here).
• Update README with finer details.
• Make OVERLEAF_COOKIE input value to support overleaf_session2=xyz or just xyz.
• Add OVERLEAF_HOST input value.

v1.0.0-alpha

Add core functionality to download the project files, extract them, and commit to the repository.