Explain flatpak debugging

Is this a request to add, remove, or change content?

• Add
• Remove
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If you would like to have content added, please describe which content is needed.

Please expain how to debug flatpaks (prompted by https://source.puri.sm/Librem5/Apps_Issues/merge_requests/5). A broad introduction then linking out to proper uptream docs would do IMHO.

If you would like to remove or change content, what is the relevant page and section?

If this issue is regarding something else (i.e. build issue, licensing, theme, etc), please indicate the issue below.