Extract out all code examples and use literal includes instead #250
Description
Whenever a code example is present in this guide, it should be extracted to examples/ and included from there (see #239 for an example).
Only in-line code `like this` or monospace blocks (not code) like our directory outlines should be left within markdown files.
Command-line examples can also be left in. This is at the discretion of the writer. They could be extracted into e.g. .bash files, but if you are trying to show both command and output, that is not a bash script, it is terminal copy and so no longer just code. I also don't know how literalinclude would interact with multiple examples for different systems (#240).