Update more files, in the process fixing an incomplete merge that I didn't notice until I tried to do release 1.20.0.

Template repository for software projects by the Caltech Library

This release adds a new GitHub Actions workflow to run a Markdown linter program automatically over the .md files. This release also fixes a few lint errors in a few of the existing Markdown files.

Template repository for software projects by the Caltech Library

The main change introduced by this version is a mildly revised README.md structure. There is a new Quick start section, and the previous Authors & history section is gone in favor of putting that info into the Acknowledgments section.

Changes: Make programmingLanguage field in codemeta.json be a list. Remove .github/workflows/ISSUE_TEMPLATE.md because it is not actually being used by Baler.

Changes in this release: Addition of workflow for Baler Addition of workflow & config file for YAMLlint, a YAML file linter Addition of .github/SECURITY.md file, to follow GitHub best practices

This release adds a provisional .editorconfig file.

This version adds a CSS style file for the README when it's used in GitHub Pages. It provides minimal support for respect the user's dark/light mode settings.

Add more raw allowed HTML tags in Markdownlint config.