doc: Update Slack invitation link
The old link seems not to work anymore, so instead replace it with an
invitation link freshly generated.
Signed-off-by: 
Carles Cufi <carles.cufi@nordicsemi.no>
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The old link seems not to work anymore, so instead replace it with an
invitation link freshly generated.
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>