docs: note about existing content at same path on different branches

vintro

2023-08-14 f1c9ca495e450ecb62dade70c4b60d86e106f79c

 quartz/components/styles/search.scss

@@ -48,7 +48,6 @@
    overflow-y: auto;
    display: none;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);

    &.active {
      display: inline-block;