Betty 0.3.11

What's Changed

• Fix a typo on the documentation front page by @bartfeenstra in #1773
• Relicense Betty under the GNU General Public License, Version 3 or later by @bartfeenstra in #1786
• Add bin/build-dev-pip and bin/build-dev-npm to (re)run pip and npm installs separately by @bartfeenstra in #1787
• Do not explicitly set a documentation version ourselves by @bartfeenstra in #1793
• Fix an unused import by @bartfeenstra in #1795
• Add a code of conduct by @bartfeenstra in #1809
• Revert "No longer create releases for PRs (#1716)" by @bartfeenstra in #1815
• Fix a bug where PyInstaller builds would not include all data files by @bartfeenstra in #1814
• Improve the environment variables documentation by @bartfeenstra in #1817

Full Changelog: 0.3.10...0.3.11