Style from `@BondsList` can break BondTable layout

[disberd]

Showing a cell with a @BondsList output after the cell where the BondTable is created breaks the layout of the BondTable.

This is probably because the css of BondsList overwrites something in the css of BondTable.

We should have a single place where the css style is stored instead of repeating it every cell that outputs something. See also disberd/PlutoDevMacros.jl#16

[disberd]

This was actually a typo in the css stylesheet for the BondsList, fixed in #42