Diagrams (with overview fix and configurable theme)

Use configurable mermaid theme (default `dark`)

I’ve added CSS to change edge labels to use a blurred backdrop rather than having a solid fill, as it makes them feel like entities on their own in the diagram with the theme defaults.

Diagrams (with overview fix)

Fixes an issue where the diagram did not render properly when navigating to it via the overview using the keyboard.

Diagrams

• Mermaid diagram integration #39
• Add list fragment shorthand #26
• Add background image shorthand #25

4.0.0

• Fixes to #17
• add a Gemfile to permit builds on hosts that do not infer dependencies (like Netlify)
• exclude unnecessary files from the conversion to keep the generated _site folder clean
• switch Markdown parser for better compatibility with recent Jekyll versions as run on GitHub Pages
• Fix typo in the README: Wether -> Whether

Thanks to @mrmanc @infotexture

3.0.0

• Supports Reveal 3.7.0
• Updated README

2.0.0

• Changed versioning to adhere to semver standards
• Used rouge syntax highlighter instead of pygments because of Github pages issues. Thanks, @mrmanc

v1.5

• Better Support for GitHub Pages by introducing a new method for including backgrounds and Fragments (please see README.md)
• The old method ({% fragment %}), that used custom plugins is now deprecated and will be removed in the future
• Moved layout code from index.html to _layout/. Please check your code, if you have modified that part in index.html

Thanks to @mrmanc

v1.4

• Support of custom CSS modifications
• Support for an easier way for specifying reveal_options

v1.3

• Compatibility with Jekyll 3.4.1 (Thanks to @Phlow)

v1.2

• Updated highlighter configuration to get rid of deprecation notice for current Reveal.js versions (since 2.0 actually)