First contribution hurdles in .gitignore, workflow, scripts

[MusicalNinjaDad]

Operating system: Windows11 / WLS2 (Ubuntu 20.04)
Python version: 3.12
Pi model: N/A
GPIO Zero version: N/A
Pin factory used: MockFactory

As a first time contributor I ran into minor issues which required simple adjustments to make developing feasible.
I develop in a simple virtual environment (via python -m venv .venv) for each project leaving my system and user level python untouched, use vscode as an editor and like to have github actions run regression tests on a matrix of versions for each push on every branch

1. .gitignore doesn't have relevant entries for venv or vscode
2. .github/workflows/test.yml only triggers on master
3. the doc preview script uses the system-wide default python and not the virtual environment

While making these minor changes is not a big deal after forking, they need to be excluded from any pull requests - leading to more complicated rebasing before raising a PR and limited testing possible after rebasing. Without the .gitignore changes, git identified 4987 changed files in the branch I created for a PR - which makes it easy to make a mistake.