Feature/na 356 changes

[seankmartin]

Changes:

1. Removes all the svg files that are not from ikonate
2. Small changes in the css to account for change 1 upsetting some padding and margins
3. Remove the border on the right and left from the panel resolution table (the layer resolution table already had this)
4. Small refactor in CSS
5. More specific usage in CSS for the elements as they were bleeding through to main neuroglancer. Use :is for this, but open to suggestions.

[seankmartin]

For me, one change is not showing in the PR review, so just in case. I changed the div span... selector to use :is because they were bleeding through to regular neuroglancer div and span etc. elements without it. Let me know if you have another suggestion!

.neuroglancer-screenshot-overlay
  :is(
    div,
    span,
    a,
    img,
    h1,
    h2,
    h3,
    h4,
    h5,
    h6,
    p,
    form,
    input,
    textarea,
    select,
    strong,
    table,
    tr,
    td,
    th,
    tbody,
    button
  ) {
  box-sizing: border-box;
  outline: 0;
}

[vidhya-metacell]

@seankmartin everything looks good,
for the :is, I usually do .classname * { } like this, but if it reflecting the css then great, no issues