This adds generic sort / sortRev functions for use in gmnhg templates
which use sort.Sort to sort anything that implements sort.Interface
(which includes lists of posts).
The existing sortPosts function that used to sort posts in reverse order
becomes an alias to sortRev for backwards compatibility.
This makes the renderer preserve existing line breaks in blockquotes,
provided they do not split paragraphs. Some clients/sites may use this
to form semantic around line breaks (for instance, for poems).
See #5.
This adds support for Markdown table rendering with
github.com/olekukonko/tablewriter. Tables are rendered as ASCII text
in a preformatted text block. Cells are hard-aligned with spaces.
tablewriter options are not yet configurable, although they should be.
For now, extra formatting inside tables is omitted.
Fixes#2.
Unlike Markdown, which has 6 levels of headings, Gemini spec (p. 5.5.1)
only allows up to 3 shebang characters before a space. This adds an extra
space before levels 4-6 in order to comply with the spec.
Fixes#1.
This refactoring simplifies some originally quirky parts of rendering
code while also adding support for rendering emphasized text (handled by
the same routine the ordinary text already is).
