docs: [debug a snap] mention that snappy-debug is a snap, and fix broken 'Debugging snaps' link
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Issue body
*Please describe the question or issue you're facing with "Debug a snap - Snapcraft 8.11.2 documentation".*
1. It would be helpful to add a "install the snap" to the list of instructions for how to use `snappy-debug`
2. Clicking the `Debugging snaps` link at the end of the page just causes the page to be redisplayed (i.e. it doesn't display a different page)
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*Reported from: https://documentation.ubuntu.com/snapcraft/stable/how-to/debugging/debug-a-snap/?_gl=1*gxbgiu*_gcl_aw*R0NMLjE3NTAxNzQxMDkuQ2p3S0NBandwTVRDQmhBLUVpd0FfLU1zbVgwaEZ3UVRhWk4wV0Nyekx4bTFhSzk5YkwtVDRwOGkwUTJlOUNJam05Tm5YbmNSYVlzYjBSb0N1Ym9RQXZEX0J3RQ..*_gcl_au*OTQwMDE3MjYwLjE3NDg1MzgzMjY.*_ga*MzAyNzgwMDEwLjE3Mjk5NTA0MDE.*_ga_5LTL1CNEJM*czE3NTYxNTE0NTIkbzI3MiRnMSR0MTc1NjE1MTUxNCRqNjAkbDAkaDA.*
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