Rename snippet to css :not selector shortcut

snippets/css-not-selector-shortcut.md

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+### CSS :not selector shortcut
+
+Lots of code just to space each item evenly, except for the last one is just one great example for the `:not` psuedo selector.
+
+#### HTML
+
+```html
+
+```
+
+#### CSS
+
+```css
+
+```
+
+#### Demo
+
+<!-- You must create a `snippet-demo` parent block and use it as a namespace with BEM syntax. -->
+
+<div class="snippet-demo">
+  <some-element class="snippet-demo__snippet-name"></some-element>
+</div>
+
+<!-- Add your style rules here. -->
+
+<style>
+
+</style>
+
+#### Explanation
+
+<!-- Use a step-by-step (ordered) list if possible. Keep it concise. -->
+
+#### Browser support
+
+<!-- Use the checkmark or the warning emoji, see the existing snippets. -->
+
+<span class="snippet__support-note">✅ No caveats.</span>
+
+<!-- Whenever possible, link a `caniuse` feature which allows the browser support percentage to be displayed.
+If no link is provided, it defaults to 99+%. -->
+
+* https://caniuse.com/#feat=css-sel3
+
+<!-- tags: layout -->