Description

Please add a demo of the new user-defined topics feature in the Jupyter Colab walkthrough.

Rationale

Alex Nikic @AlexNikic has added user-defined topics in release https://github.com/harmonydata/harmony/releases/tag/v1.0.5

The matcher now allows users to pre-define topics, which the matcher will now use to tag the questions where the word-to-topic cosine similarities of the questions are above a certain threshold.

PR: #104

Issue: #82