refactor(commands): separate commands and its core into two folders (#32)

- I think it would be better if one for commands only, one for the spec
handling core logic so people won't be confused by the core logic inside
the commands folder (cleaner I guess)
- Regen docs

commands/ops/watson.go

@@ -1,14 +1,14 @@
 package ops
 
 import (
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "watson",
 		Description: "A wonderful CLI to track your time",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "add", Description: "Add time to a project with tag(s) that was not tracked live"},
 			{Name: "DATETIME", Description: "The start time. Ex: 2022-03-04 12:00:00"},
 			{Name: "aggregate", Description: "Display a report of the time spent on each project aggregated by day"},
@@ -30,7 +30,7 @@ func init() {
 			{Name: "sync", Description: "Get the frames from the server and push the new ones"},
 			{Name: "tags", Description: "Display the list of all the tags"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--from", Description: "Date and time of start of tracked activity"},
 			{Name: "--to", Description: "Date and time of end of tracked activity"},
 			{Name: "--confirm-new-project", Description: "Confirm creation of new tag"},