remove the UA module, as it is its own library now, and not actually used by this project

Author: tayloraswift

Package.resolved

@@ -62,8 +62,6 @@ let package:Package = .init(
         .library(name: "System_", targets: ["System_"]),
         .library(name: "System_ArgumentParser", targets: ["System_ArgumentParser"]),
 
-        .library(name: "UA", targets: ["UA"]),
-
         .library(name: "UnidocAPI", targets: ["UnidocAPI"]),
         .library(name: "UnidocAssets", targets: ["UnidocAssets"]),
         .library(name: "UnidocAssets_System", targets: ["UnidocAssets_System"]),
@@ -205,7 +203,6 @@ let package:Package = .init(
             dependencies: [
                 .target(name: "_AsyncChannel"),
                 .target(name: "HTTP"),
-                .target(name: "UA"),
 
                 .product(name: "Firewalls", package: "swift-ip"),
                 .product(name: "IP", package: "swift-ip"),
@@ -450,11 +447,6 @@ let package:Package = .init(
                 .product(name: "Atomics", package: "swift-atomics"),
             ]),
 
-        .target(name: "UA",
-            dependencies: [
-                .product(name: "Grammar", package: "swift-grammar"),
-            ]),
-
         .target(name: "Unidoc"),
 
         .target(name: "UnidocAPI",
@@ -711,11 +703,6 @@ let package:Package = .init(
                 .target(name: "TopologicalSorting"),
             ]),
 
-        .testTarget(name: "UATests",
-            dependencies: [
-                .target(name: "UA"),
-            ]),
-
         .testTarget(name: "UnidocDBTests",
             dependencies: [
                 .target(name: "UnidocTesting"),