Update Privacy Policy (#2860)

* Update Privacy Policy

Supersedes #2775

Signed-off-by: Thib <[email protected]>

* Update content/legal/privacy-notice.md

Co-authored-by: Hugh Nimmo-Smith <[email protected]>

* Fix leftover bold titles

Signed-off-by: Thib <[email protected]>

* Remove ref to matrix archive

Signed-off-by: Thib <[email protected]>

* Add markup for world_readable

Signed-off-by: Thib <[email protected]>

* Fix remainign remarks

Signed-off-by: Thib <[email protected]>

* Drop Hydrogen

Signed-off-by: Thib <[email protected]>

* Fix remaining nits

Signed-off-by: Thib <[email protected]>

* Use a relative link when linking to m.org

Signed-off-by: Thib <[email protected]>

* Fix headings

Signed-off-by: Thib <[email protected]>

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Signed-off-by: Thib <[email protected]>
Co-authored-by: Hugh Nimmo-Smith <[email protected]>

Author: thibaultamartin