Do a large chunk of the move to go

This commit moves a huge chunk of the code to go. The TODO.md document
indicates what is left to be done.

env/stack_web.go

@@ -0,0 +1,19 @@
+package env
+
+import "github.com/FAU-CDI/wisski-distillery/internal/stack"
+
+func (dis *Distillery) WebStack() stack.Installable {
+	return dis.asCoreStack(stack.Installable{
+		Stack: stack.Stack{
+			Name: "web",
+		},
+
+		EnvFileContext: map[string]string{
+			"DEFAULT_HOST": dis.Config.DefaultDomain,
+		},
+	})
+}
+
+func (dis *Distillery) WebStackPath() string {
+	return dis.WebStack().Dir
+}