docs: add Windows setup notes

[tomatotomata]

Closes #493

I followed the Getting Started guide from Windows and added a focused Windows notes section.

The guide now:

• shows PowerShell docker compose commands for the database, CORE, and API services
• explains that Docker Desktop's Linux engine must be running
• documents docker compose config --quiet as a local Compose-file validation
• directs Windows users to WSL or Git Bash for the POSIX run_e2e.sh script
• calls out Go 1.19+ and Ballerina as separate PATH prerequisites for non-container development

Validation:

• docker compose config --quiet
• npm ci in docs
• npm run build -- --no-minify in docs (passes; existing broken-anchor warning remains elsewhere)
• git diff --check

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