Hotchocolate

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A release with a single bugfix:

- If a title contained a colon, it wouldn't show up on a post. Now it shows
up correctly.

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A fairly significant rewrite of the internals:

- Now only supporting Python 3.6.
- Settings are now defined in TOML, not INI files.
- A big focus on writing more `"sans IO" <https://sans-io.readthedocs.io/>`_-style code, and putting some tests around it.
- Templates and styles now live in a site directory, rather than being a weird
(and undocumented) mixture of files in the site and in the package.
- There's no longer a network dependency as part of the build step.
- Hopefully quite a bit faster, less buggy, and easier to manage.

Documentation is still fairly patchy/non-existent, but I'm trying to reduce the number of undocumented assumptions so that it becomes easy (or possible) for somebody else to reuse it.

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Bugfixes:

- Stop builds from hanging forever on slow connections.
- Make ``<pre>`` blocks distinguishable when used in ``<blockquote>``.

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Features:

- A rudimentary ``newpost`` command for creating a new post with some prefilled
metadata.

Bugfixes:

- Add the missing Pygments dependency to syntax highlighting is applied to
code blocks.

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Here "2.0" is really a count of the number of websites I have using this tool,
rather than a reflection of quality. Lots of new stuff added since 1.0.2,
but mostly untested and documented (note to self: fix that!).

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Two accessibility-related bugfixes, both found with `pa11y <https://github.com/pa11y/pa11y>`_:

- Render heading links as an HTML ``<ul>`` list.
- Only include ``<h1>`` tags for the title of a page if the title is
non-empty.