Security Council Elections Upgrades

[godzillaba]

Add an additional 7 day window for contenders to add themselves before voting starts.

Only allow contenders to add themselves by signature, ensuring they are an EOA that can sign on all chains.

[DZGoldman]

let's update the docs as well; I think just security-council-mgmt.md and the pngs security-council-colors.png & security-council-election-flow.png (i dunno who has the source for the pngs or what)

[godzillaba]

let's update the docs as well; I think just security-council-mgmt.md and the pngs security-council-colors.png & security-council-election-flow.png (i dunno who has the source for the pngs or what)

the diagrams and text are updated now