Remove redundant CLI argument for vc create --sign

[KendallWeihe]

We use to have to go something like web5 vc create <id> --sign --portable-did <portable did> but the --sign and --portable-did are redundant. So now it's just web5 vc create <id> --sign <portable did> (removed --portable-did)

Example:

web5-go on  main [$!] via 🐹 v1.22.0
➜ web5 vc create testing123 --sign '{"uri":"did:jwk:eyJrdHkiOiJPS1AiLCJjcnYiOiJFZDI1NTE5IiwieCI6Il9EZ3p1cHNRb3h6YWlUNG9mYmprLUpkS1hLamJldlNnc05DWlVfWFpLdjAifQ","privateKeys":[{"kty":"OKP","crv":"Ed25519","d":"MBCR01OIBKA_XFSpI55CH2v-HdZb-GWeDPwWKChnq_v8ODO6mxCjHNqJPih9uOT4l0pcqNt69KCw0JlT9dkq_Q","x":"_DgzupsQoxzaiT4ofbjk-JdKXKjbevSgsNCZU_XZKv0"}],"document":{"@context":"https://www.w3.org/ns/did/v1","id":"did:jwk:eyJrdHkiOiJPS1AiLCJjcnYiOiJFZDI1NTE5IiwieCI6Il9EZ3p1cHNRb3h6YWlUNG9mYmprLUpkS1hLamJldlNnc05DWlVfWFpLdjAifQ","verificationMethod":[{"id":"did:jwk:eyJrdHkiOiJPS1AiLCJjcnYiOiJFZDI1NTE5IiwieCI6Il9EZ3p1cHNRb3h6YWlUNG9mYmprLUpkS1hLamJldlNnc05DWlVfWFpLdjAifQ#0","type":"JsonWebKey2020","controller":"did:jwk:eyJrdHkiOiJPS1AiLCJjcnYiOiJFZDI1NTE5IiwieCI6Il9EZ3p1cHNRb3h6YWlUNG9mYmprLUpkS1hLamJldlNnc05DWlVfWFpLdjAifQ","publicKeyJwk":{"kty":"OKP","crv":"Ed25519","x":"_DgzupsQoxzaiT4ofbjk-JdKXKjbevSgsNCZU_XZKv0"}}],"assertionMethod":["did:jwk:eyJrdHkiOiJPS1AiLCJjcnYiOiJFZDI1NTE5IiwieCI6Il9EZ3p1cHNRb3h6YWlUNG9mYmprLUpkS1hLamJldlNnc05DWlVfWFpLdjAifQ#0"],"authentication":["did:jwk:eyJrdHkiOiJPS1AiLCJjcnYiOiJFZDI1NTE5IiwieCI6Il9EZ3p1cHNRb3h6YWlUNG9mYmprLUpkS1hLamJldlNnc05DWlVfWFpLdjAifQ#0"],"capabilityDelegation":["did:jwk:eyJrdHkiOiJPS1AiLCJjcnYiOiJFZDI1NTE5IiwieCI6Il9EZ3p1cHNRb3h6YWlUNG9mYmprLUpkS1hLamJldlNnc05DWlVfWFpLdjAifQ#0"],"capabilityInvocation":["did:jwk:eyJrdHkiOiJPS1AiLCJjcnYiOiJFZDI1NTE5IiwieCI6Il9EZ3p1cHNRb3h6YWlUNG9mYmprLUpkS1hLamJldlNnc05DWlVfWFpLdjAifQ#0"]},"metadata":null}'
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