the class removed are unused as we take advantage of classes provided by
Bootstrap instead.

Downstream lesson maintainers are supposed to adapt this to point at
their repository's issues [1], so use a reference name that works for
both the lesson-template and downstream repositories.  That way they
only have to update the referenced URL and can leave the reference
name alone.

[1]: swcarpentry/DEPRECATED-lesson-template#195 (comment)

…for-contributing-issues

CONTRIBUTING.md: Use a generic reference name for the issues link

This avoids things like:

  ~$ cat tools/validation_helpers.py
  ...
          return self.is_block(ast_node) and has_heading~$

with your next prompt way over to the right ;).

tools: Add trailing newlines to files that were missing them

(even though the contents are not validated)

Ignore conduct.md and contributing.md. No, really.

Remove logger name (root) from console messages

Because we're going to be storing maintainer information locally in
the README.md [1].

[1]: swcarpentry/DEPRECATED-lesson-template#195 (comment)

CONTRIBUTING.md: Remove the maintainer references

Add article tag as wrap for lesson content

Figures should be centered
and not overflow the screen.

Pandoc had some changes in the last versions.
Having a variable for Pandoc will help
maintainers to handle different versions of Pandoc.

…iable

Add variable to represent Pandoc

Thanks to ocefpaf for request that.

consolidate badge classes to swc.css