spicetify: add page (#8762)

pages/common/spicetify.md

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+# spicetify
+
+> A CLI utility to customize the Spotify client UI and functionality.
+> More information: <https://spicetify.app>.
+
+- Generate a configuration file on very first run and display help:
+
+`spicetify`
+
+- Backup and preprocess Spotify application files:
+
+`spicetify backup`
+
+- Print all configuration fields and values:
+
+`spicetify config`
+
+- Change the value of a configuration field:
+
+`spicetify config {{field}} {{value}}`
+
+- Apply the customization changes to Spotify:
+
+`spicetify apply`
+
+- Restore Spotify to its original state:
+
+`spicetify restore`