Convert external files into raw base64 data to be embedded into
the final HTML.
Render a <footer> element with a foot message on all slides.
The <h1> rendering function.
The <image> rendering function.
Captions of figures are buided from the third line fowards
on the raw_element.
Treats all the forms of input using Clap.
Do all the checks necessary to validate a raw_element as Element.
Render a <image class=logo> that is treated in CSS as
a fixed right top logomark to the slides.
The <pre class=mermaid> element rendering function. Resolves a mermaid
diagram passed line-by-line.
Generate an <ol> style listing.
Uses Clap to handle the output.
Finally condense back a Vec<Slide> into HTML that can be
printed or outputed.
The <h2> rendering function.
The <table> rendering function.
The <p> rendering function.
The <ul> rendering function.
The <video> rendering function.