feat: init wizard v2 improvements

[aorumbayev]

Addresses -> https://github.com/orgs/algorandfoundation/projects/1?pane=issue&itemId=53079977

Proposed Changes

• Refining presets, adding notion of a custom preset
• Reusing algokit-base-template for workspace specific artifacts - to remove coupling and redundancy
• Renaming templates_generated to more generic examples folder that by default tests the main 'starter' and 'production' presets
• Adding Contribution guide and simple starting point for generating dummy instances of templates for quick preview during development
• Fixing visitors badge
• Base template at the workspace level (see step 1 in _tasks in copier.yaml at the root) - also drops a devcontainer artifact for github codespaces (similar behaviour for all standalone templates too). Making it easy to quickly load up any workspace typed algokit project to a dev environment from their github repo. A feature heavily utilized by DevRels during various bootcamp activities, given existing feedback and feature requests as part of the wizard adr and small footprint i think its a fair point to keep devcontainers at the base template level.
• TEMPORARY - changing pipx install algokit to version from wizard v2 branch