feat: init wizard v2 improvements

[aorumbayev]

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
• Removing dependency on beaker, instead allows specifying all main frameworks to pair against default react component
• Refining codespaces setup for vscode for puya, beaker. Tealscript is currently not supporting the full e2e launch config flow hence template will only supply base codespaces file for aggregate folder preview (no custom launch configs).
• 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
• TEMPORARY - ci is to be fixed as soon as base template repo becomes public -> done

[aorumbayev]

@neilcampbell for simpler review, ignore changes in tests_generated the main gist is in template_content and copier.yaml, and examples could probably checked last.

I could rename examples back to tests_generated folder but given the presets being changed to hide all questions by default, there would have been a lot of artifacts in diff regardless since number of default scenarios is now reduced to just 2 options. The workspace structure would cause changes within each artifact as well so renaming to examples is marginally similar in size. As for why its set to examples, see a note in README.md that mentions that this folder can be used for quick preview of sample pre-made projects.

[aorumbayev]

@neilcampbell feel free to unresolve any of the above but should be now addressed. Will check out the comments on react