* Update authors to "jrnl contributors" to comply with GPL3
* Include jrnl email address with contributors
* Include GPL notice in jrnl --version
* Apply consistent copyright and license to all Python files
* Add copyright and license to documentation
* Add copyright and license to docs theme
* Wiping poetry cache to try to resolve a test issue
* Testing with Python 3.9.0 in attempt to bypass GitHub Actions failure in 3.9.1
* make format
* Exclude Windows Python 3.9 build which is failing due to a GitHub Actions problem
* Modify testing to get around this 3.9 issue...
* Fix exclude
* add some attribtutes to docs template for accessbility
* fix colors to meet accessibility guidelines (4.5 contrast ratio for text)
* Fix last remaining pa11y error (no button on search form)
This fix required moving the mkdocs theme out of the docs directory.
It's no in the docs_theme directory, and the mkdocs config is updated
accordingly.
* Re-enable accessibility testing for docs sit
Also, move the pa11y script into the gh actions workflow
* clean up linting issues in css
* fix and standardize link colors across site
* fix twitter button opacity making text fail contrast requirements
* move buttons on docs site index nav, tweak font weights
* fix footer opacity, tweak spacing of the now more visible sections of the page
* change font sizes on index page to meet WCAG
* udpate font sizes site-wide for accessibility
* fix sidebar for accessibility (font sizes and color contrasts)
* restyle code blocks to have dark background, and meet accessibility requirements
* standardize (accessible) colors across docs site
