Add link to the github repo on the official extension page

[jerabaul29]

This page:

https://marketplace.visualstudio.com/items?itemName=streetsidesoftware.code-spell-checker#overview

Has not link to this repo. Maybe it would be a good idea to add?

[Jason3S]

Thank you.

[Peter-Darton-i2]

I've just checked and the overview page (both within VSC and at the URL above) has a link called "Repository" that links to this repo.

I think this can be closed.

[github-actions[bot]]

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