Drop lock files from repo (#1282)

web/_tool/pubspec.lock

@@ -1,47 +0,0 @@
-# Generated by pub
-# See https://dart.dev/tools/pub/glossary#lockfile
-packages:
-  args:
-    dependency: transitive
-    description:
-      name: args
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.3.0"
-  charcode:
-    dependency: transitive
-    description:
-      name: charcode
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.3.1"
-  lints:
-    dependency: "direct dev"
-    description:
-      name: lints
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.0"
-  markdown:
-    dependency: "direct main"
-    description:
-      name: markdown
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "5.0.0"
-  meta:
-    dependency: transitive
-    description:
-      name: meta
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.7.0"
-  path:
-    dependency: "direct main"
-    description:
-      name: path
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.8.1"
-sdks:
-  dart: ">=2.17.0-206.0.dev <3.0.0"