CONTRIBUTING.md fixes

[TinyMarsh]

Updates the CONTRIBUTING.md and LICENSE.md files to tailor them for the "Further Git and GitHub for Effective Collaboration" course, removing references to The Carpentries and updating contact and repository information.

Also add .venv to the .gitignore.

Closes #141

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/ImperialCollegeLondon/rse_further_git_course/compare/md-outputs..md-outputs-PR-179

The following changes were observed in the rendered markdown documents:

 LICENSE.md | 3 +--
 md5sum.txt | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

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⏱️ Updated at 2026-03-10 18:46:49 +0000

[SaranjeetKaur]

Looks perfect. Thanks @TinyMarsh!