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

vintro

2023-08-14 f1c9ca495e450ecb62dade70c4b60d86e106f79c

 quartz/components/styles/graph.scss

@@ -43,7 +43,6 @@
    width: 100vw;
    height: 100%;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: none;
    overflow: hidden;