Remove the integration module.

This change removes re-exports of dependencies. These re-exports provide
direct access to transient dependencies, but this crate isn't helped
much by this and it may in fact be an anti-pattern. Downstream crates
should probably manage dependencies like `miette` and `mitsein` via
Cargo and other standard practice instead.

src/lib.rs

@@ -11,13 +11,6 @@ use std::fmt::{self, Debug, Display, Formatter};
 use std::iter::{Chain, Flatten};
 use std::option;
 
-pub mod integration {
-    pub mod miette {
-        #[doc(hidden)]
-        pub use ::miette::*;
-    }
-}
-
 pub mod prelude {
     pub use crate::{
         BoxedDiagnosticExt as _, DiagnosticExt as _, DiagnosticResultExt as _, ErrorExt as _,