message: make dashboard component more flexible
  handle case for dashboards with too little content
  also remove the dashboard body container overflow
diff: --boxel-dashboard-left-edge-width: 5rem; /* 80px */
  position: relative;
  + min-height: 100%;
  display: grid;
  grid-template-rows: auto 1fr;
  background-color: var(--boxel-dashboard-background-color);
  z-index: 0;
  }
  -.boxel-dashboard__body-container {
  - overflow: auto;
  - min-height: 50vh;
  -}
  -
  .boxel-dashboard--with-left-edge {
  grid-template-columns: auto 1fr;
  }
  