Fix/config update

[miriam-z]

Description

This PR fixes Makefile syntax errors that were preventing proper execution with .ONESHELL mode, updates the Python version to match the Dockerfile, and improves the README with comprehensive setup instructions.

Changes include:

• Fixed bash syntax in _install-dependencies and _test targets with proper line continuations and semicolons
• Updated .tool-versions to use Python 3.13.7 (matching Dockerfile)
• Added setup prerequisites (asdf) and environment configuration steps to README
• Documented the .env.example copy step and database migration requirement

Context

The Makefile targets were failing with "syntax error: unexpected end of file" because the bash commands weren't properly formatted for Make's .ONESHELL mode. This blocked developers from running make config and
make test successfully.

Additionally, the README was missing critical setup steps that new developers would need, including:

• How to configure asdf and install dependencies
• The requirement to copy .env.example to .env
• Running database migrations after starting the app

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes (N/A - documentation and build script fixes)
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.

[Themitchell]

Because migrations run through docker compose running make dev-migrate will bring up the postgres container and run the migrations from the web container which means you don't need to start the application first. The docker compose file just habdles the stack for you so theres no interdependency there :)

[miriam-z]

Sounds good, I will make this edit.

[Themitchell]

Looks good bar the small comment re starting the app before running migrations