added validator activity page (`/validators/activity`) #225

Job	Run time
Run code checks / Run code checks	26s
Build Dora / Build windows/amd64 binary	3m 27s
Build Dora / Build linux/amd64 binary	23s
Build Dora / Build macos/amd64 binary	2m 25s
Build Dora / Build macos/arm64 binary	2m 4s
Build Dora / Build linux/arm64 binary	1m 28s
Build Dora / Build amd64 docker image	23s
Build Dora / Build arm64 docker image	1m 24s
Build Dora / Build multiarch docker image	15s
Build Dora / Build additional docker manifests (master)	8s
Build Dora / Build additional docker manifests (master-latest)	9s
Create snapshot release	21s
Copy docker images / Clone docker images to pk910/dora-the-explorer	7s
	13m 0s

Provide feedback