docs: Add information on the new release philosophy (#1592)

docs/rolling-back.md

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+# Rolling Back
+
+There may be many versions of this card (see [release philosophy](./developing.md?id=release-philosophy)). If you experience trouble with one version, you can always rollback to a prior version.
+
+### Rolling Back in HACS
+
+- Open your Home Assistant instance and navigate to `HACS` in the sidebar
+- Choose "Frontend"
+- Click on "Frigate Card"
+- Click on the "Three dots menu"
+- Choose "Redownload"
+- Select the version you wish to change to
+- Click "Download"
+- Reload your browser
+
+### Rolling Back Manually
+
+If you didn't use `HACS` to install the card, you're on your own to roll it
+back! Generally though this amounts to simply "replacing" an installation with
+an older one, by following the [manual
+installation](./advanced-installation.md?id=manual-installation) instructions
+and simply choosing an older version to install.