feat: add upgrade guide (tauri-apps#1340)

* feat: add upgrade guide

* update paragraph

Signed-off-by: Lorenzo Lewis <[email protected]>

* lots of updates

Signed-off-by: Lorenzo Lewis <[email protected]>

* refactors

Signed-off-by: Lorenzo Lewis <[email protected]>

* add link to migrate cli command

Signed-off-by: Lorenzo Lewis <[email protected]>

* add examples

* change high-level phrasing to upgrade

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

---------

Signed-off-by: Lorenzo Lewis <[email protected]>
Signed-off-by: GitHub <[email protected]>
Co-authored-by: Lorenzo Lewis <[email protected]>

Author: 2 people