This folder contains the files necessary for the math4 theme.  These files are
tracked by git and any changes made to them will be overwritten when you
upgrade.  The two exceptions are math4-overrides.css and math4-overrides.js.

These files do not need to be present, but if they are they will be included in
system.conf and can be used for general overrides.  They can created by copying
math4-overrides.css.dist and math4-overrides.js.dist.  This is similar to how
localOverrides.conf interacts with defaults.conf and localOverrides.conf.dist.
In particular if you upgrade your server math4-overrides.js and
math4-overrides.css  will not change, but their .dist versions and the other
math4 theme files may change. This might cause problems until you merge the
changes.

If you want to customize math4 you should only change math4-overrides.css and
math4-overrides.js.  Note: Because you can include arbitrary JavaScript in
math4-overrides.js you can actually change pretty much anything, including
adding new html or changing existing html.