docs(README): Fix MD syntax & regenerate HTML

README.md

@@ -251,43 +251,30 @@ There are a few key rules enforced by Stylelint:
   - reference for crafting your own themes.
 
 To tweak or adjust an existing theme, you may override some common CSS variables found in the themes.
-
-Available CSS variables are:
---color-accent: Color for accent elements, primarily used to add a brand highlights to the theme.
---color-key: Color for body text, and other elements using the inherited body text color.
---color-neutral: Subtle color, usually shades of gray, for element borders and other subtle details.
---color-stock: Article/Page background color, but also used for other elements.
---font-family-body: Font-family for paragraphs and other non-headline elements
---font-family-heading: Font-family for paragraphs and other non-headline elements
---font-family-mono: Font-family for monospaced text elements such as \`pre\` and \`code\`.
---max-width: Max width for textual elements and other non-media content.
---max-width-media: Maximum width for media content, including images and interactive Code Chunks.
-
-Note that not all themes make use of all available variables, and that some may expose additional options.
-Please refer to the specific theme documentation.
+Please refer to the specific theme documentation for available variables.
 
 Type selectors
 
-For types defined in http://schema.org (e.g. \`Article\`), or extensions such as,
-http://schema.stenci.la (e.g. \`CodeChunk\`), http://bioschemas.org (e.g. \`Taxon\`) etc.
+For types defined in http://schema.org (e.g. `Article`), or extensions such as,
+http://schema.stenci.la (e.g. `CodeChunk`), http://bioschemas.org (e.g. `Taxon`) etc.
 
 Conventions:
 
 - use the same upper camel case as in the schema the type is defined in
-- use a \`[itemtype=...]\` selector if possible (i.e. if Encoda encodes it in HTML)
+- use a `[itemtype=...]` selector if possible (i.e. if Encoda encodes it in HTML)
 
 Property selectors
 
 For properties of types defined in schemas. Note that
-some of these select an entire container property e.g. \`authors\` and
+some of these select an entire container property e.g. `authors` and
 selector for a class, and some select items in those properties
-e.g. \`author\` and select for a \`itemprop\`.
+e.g. `author` and select for a `itemprop`.
 
 Conventions:
 
 - use the same lower camel case as in the schema the property is defined in
-- use a \`.class\` selector for container properties
-- use a \`[itemprop=...]\` selector for singular properties, or items of container properties
+- use a `.class` selector for container properties
+- use a `[itemprop=...]` selector for singular properties, or items of container properties
 
 There are several additional selectors which are not found as the Stencila Schema definitions. These are: