Replaced ilios-browser-defaults SASS mixin with shared class

[michaelchadwick]

Refs ilios/ilios#6608
Fixes ilios/ilios#6669

After a suggestion, this has been renamed from ilios-browser-defaults to normalize-external-editor to better reflect its utility (resetting styles for HtmlEditor component instances).

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[jrjohnson]

As a mixin this name was ok and worked, but as a class I think it probably needs to be split up into reset-list and reset-paragraph (or something like that) and turned into separate classes. class="sessiondescription ilios-browser-defaults" is confusing.

[michaelchadwick]

As a mixin this name was ok and worked, but as a class I think it probably needs to be split up into reset-list and reset-paragraph (or something like that) and turned into separate classes.

I can understand wanting to rename it, but why separate classes? I mean, unless you think we need a utility class that just sets p { margin: 0; }. The list and paragraph rules seem to fit into a normalize-external-editor grouping that has always gone together and would continue to do that.

[jrjohnson]

I like that name. I was only pulling them apart because I couldn't think of how to keep them together with a good name. Go for it.

[dartajax]

seems fine to me - not sure what to test but clicked around quite a bit and looked for anything awry - nothing found - approval granted