refactor/internal (#1216)

* refactor: update import paths in gateway handlers

* refactor: remove obsolete devtools Makefile and README

* build: optimize build process for improved efficiency

* refactor: remove obsolete pkl files related to Matrix and Sonr network configurations

* refactor: move embed code to x/dwn/types

internal/crypto/ucan/proof.go

@@ -0,0 +1,17 @@
+package ucan
+
+import (
+	"github.com/ipfs/go-cid"
+)
+
+// Proof is a string representing a fact. Expected to be either a raw UCAN token
+// or the CID of a raw UCAN token
+type Proof string
+
+// IsCID returns true if the Proof string is a CID
+func (prf Proof) IsCID() bool {
+	if _, err := cid.Decode(string(prf)); err == nil {
+		return true
+	}
+	return false
+}