fix: added note about the seeding step to Readme

[bryszard]

Description

While setting up the project for local development, I've noticed one unclear instruction in the Readme. It instructs to run the db:seed command, although seeding is part of the bin/init script.

I've decided to add a note to prevent confusion for future contributors.

Fixes # (issue)

N/A

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

Manual review steps

1. Setup fresh avo repository locally by running bin/init
2. Log in to the dashboard with avo@avohq.io / secret credentials

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