Improved warnings

Run modules if secrets exist

v0.0.2 - Added NOTION_MAIN_PAGE_ID as parameter

v0.0.1 - Beta version

- New source: Nordigen's OB API.
- New source: Coinbase's API.
- New output: Notion.
- Created basic internal models for banks, transactions and accounts.
- New GitHub Action to run every day.
- Created a basic README.md.