Overhaul end user documentation

docs/user_documentation/queue/add_series.md

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+# Add series to your queue
+
+Add entire series to your queue to start listening to them. Choose from the following __Play options__:
+
+- __Play__ – remove all content from the queue and play the selected series.
+- __Add to queue__ – add the selected series to the end of the queue.
+- __Play next__ – add the selected series to the next position in the queue.
+- __Play now__ – play the selected series immediately but do not clear the queue.
+
+To add a series to the queue from the album details page:
+
+1. Go to the series' details page.
+2. Select the orange play button ({fa}`play`) to __Play__ the series. Select the dropdown icon ({fa}`caret-down`) to select a different __Play option__.
+
+You're done! You've added the series to your queue.