You need to put the popular tags widget on the categories sidebar and use the custom css/js from the other thread.
How to add a flag or what plugin can do it
@holly the imae you are referencing is from nodebb-plugin-question-and-answer.
But i think the plugin puts certain flags on the post according to the state of the question, in this plugin they are not generic. You could use it as a reference to make your own.
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