Improves .editorconfig compatibility

[pgmccann]

My text editor (NeoVim) reports the following error when editing a workshop template:

editorconfig: invalid value for option trim_trailing_whitespace: false  # keep trailing spaces in markdown - 2+ spaces are translated to a hard break (<br/>). trim_trailing_whitespace must be either "true" or "false"
editorconfig: invalid value for option max_line_length: 100  # please keep this in sync with bin/lesson_check.py!. max_line_length must be a number or "off"

As per https://editorconfig.org:

Comments should go on their own lines.

This change brings .editorconfig in line with the file format as documented.

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