Making a PDF guide for music-blocks and improving the guide webpage

[Karan-Palan]

Desired Behavior

Add a PDF guide for Musicblocks guide and make it available to download

Checklist

• [x] I have read and followed the project's code of conduct.
• [x] I have searched for similar issues before creating this one.
• [x] I have provided all the necessary information to understand and reproduce the issue.
• [x] I am willing to contribute to the resolution of this issue.

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