metainfo: Expand and modernize

Brage Fuglsethrequested to merge
bragefuglseth/Solanum:main into main
  • Rename to .metainfo.xml
  • Remove ignored/obsolete tags:
    • <kudos>
    • <provides><id>….desktop</id></provides>
  • Replace Purism's old custom support tag with proper HW support info
Edited by Brage Fuglseth

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