Add the Intel NUC13 to the recommended hardware list

[nathandyer]

Status

Ready for review (although @zenmonkeykstop may prefer to hold off on merging until he is able to test the system as well)

Description of Changes

• Description: This PR adds the Intel NUC13 to the recommended hardware list, including the hardware end-of-life table, and provides an updated photo showing the wireless card removal.

• Related Issues https://github.com/freedomofpress/securedrop-docs/issues/480

Testing

• [ ] Visual review
• [ ] CI passes

Release

• Can be merged and tagged in a stable release at any point (does not need to coincide with a server release)

Checklist (Optional)

• [x] Doc linting (make docs-lint) passed locally
• [ ] Doc link linting (make docs-linkcheck) passed
• [x] You have previewed (make docs) docs at http://localhost:8000