Migrate the flutter/flutter wiki to docs/unsorted_wiki (#148562)

Part of flutter/flutter#145009
This is part one of the wiki migration.
This moves all wiki pages wholesale into the new docs directory with no changes.
Follow up PRs will sort them, updating breadcrumbs and links.

Author: Piinks

dev/bots/analyze.dart

@@ -1240,7 +1240,10 @@ Future<void> verifyIssueLinks(String workingDirectory) async {
   final Set<String> suggestions = <String>{};
   final List<File> files = await _gitFiles(workingDirectory);
   for (final File file in files) {
-    if (path.basename(file.path).endsWith('_test.dart') || path.basename(file.path) == 'analyze.dart') {
+    if (path.basename(file.path).endsWith('_test.dart')
+      || path.basename(file.path) == 'analyze.dart'
+      // TODO(Piinks): Disables checks in docs/unsorted, enabling unchanged initial migration, https://github.com/flutter/flutter/issues/145009
+      || file.path.contains('unsorted_wiki')) {
       continue; // Skip tests, they're not public-facing.
     }
     final Uint8List bytes = file.readAsBytesSync();
@@ -1322,6 +1325,10 @@ Future<void> verifyRepositoryLinks(String workingDirectory) async {
   final Set<String> suggestions = <String>{};
   final List<File> files = await _allFiles(workingDirectory, null, minimumMatches: 10).toList();
   for (final File file in files) {
+    // TODO(Piinks): Disables checks in docs/unsorted, enabling unchanged initial migration, https://github.com/flutter/flutter/issues/145009
+    if (file.path.contains('unsorted_wiki')) {
+      continue;
+    }
     final Uint8List bytes = file.readAsBytesSync();
     // We allow invalid UTF-8 here so that binaries don't trip us up.
     // There's a separate test in this file that verifies that all text