Fix link to home and add canonical urls.

[robinlinden]

Fixes #21

This change is 

[iphydf]

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Reviewed 2 of 2 files at r1. Review status: all files reviewed at latest revision, all discussions resolved, some commit checks failed.

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Comments from Reviewable

[cebe]

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Reviewed 2 of 2 files at r1. Review status: all files reviewed at latest revision, all discussions resolved, some commit checks failed.

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Comments from Reviewable