fix: rename .copierdev.yml.jinja by using {%if emit_copierdev%}

docs: update readme

feat: add mypy to workflow

refactor: make update-lock.sh easier to reuse

feat: add update-lock.sh

refactor: remove create-testproj.sh (use copierdev instead)

fix: add --reisntall to the install command

feat: make project_dir multi-line for readability

feat: add suffix to project_dir when emit_copierdev

feat: add [tool.poe.tasks] to pyproject.toml

feat: add poethepoet

feat: replace uv.lock with uv.lock.jinja

feat: add .copierdev.yml.jinja to be used by copierdev

docs: update readme

feat: add "from __future__ import annotations"