refactor: remove rust project

Removes rust directory containing the pubky library.
Updates build scripts to include local and remote options.
Updates README.md.
Adds simple-git as a dev dependency.

setup-remote-android-bindings.js

@@ -0,0 +1,82 @@
+const fs = require('fs').promises;
+const path = require('path');
+const simpleGit = require('simple-git');
+
+// Configuration
+const repoOwner = 'pubky';
+const repoName = 'pubky-core-mobile-sdk';
+const branch = 'main';
+const ktPath = 'bindings/android/pubkymobile.kt';
+const ktDestinationPath = 'android/src/main/java/uniffi/pubkymobile/';
+const jniPath = 'bindings/android/jniLibs';
+const jniDestinationPath = 'android/src/main/jniLibs/';
+const tempDir = 'temp';
+
+async function runSetup() {
+  try {
+    console.log('Removing existing files...');
+    // Remove destination directories if they exist & Clean up any lingering temporary directory
+    await Promise.all([
+      fs.rm(ktDestinationPath, { recursive: true, force: true }),
+      fs.rm(jniDestinationPath, { recursive: true, force: true }),
+      fs.rm(tempDir, { recursive: true, force: true }),
+    ]);
+
+    console.log('Creating directories...');
+    // Create destination directories if they don't exist
+    await Promise.all([
+      fs.mkdir(ktDestinationPath, { recursive: true }),
+      fs.mkdir(jniDestinationPath, { recursive: true }),
+    ]);
+
+    // Initialize Git
+    const git = simpleGit();
+
+    console.log('Cloning repository...');
+    // Clone the repository sparsely
+    await git.clone(
+      `https://github.com/${repoOwner}/${repoName}.git`,
+      tempDir,
+      ['--depth', '1', '--filter=blob:none', '--sparse', `--branch=${branch}`]
+    );
+
+    // Change directory to the cloned repository
+    const tempGit = simpleGit(tempDir);
+
+    console.log('Setting up sparse checkout...');
+    // Set sparse-checkout to include only the required directory
+    await tempGit.raw(['sparse-checkout', 'set', 'bindings/android']);
+
+    console.log('Copying Kotlin file...');
+    // Copy Kotlin file to destination
+    const ktSourcePath = path.join(tempDir, ktPath);
+    const ktTargetPath = path.join(ktDestinationPath, 'pubkymobile.kt');
+    await fs.copyFile(ktSourcePath, ktTargetPath);
+
+    console.log('Copying JNI libraries...');
+    // Copy JNI libraries directory
+    const jniSourcePath = path.join(tempDir, jniPath);
+    const jniTargetPath = jniDestinationPath;
+    await fs.cp(jniSourcePath, jniTargetPath, { recursive: true });
+
+    console.log('Cleaning up...');
+    // Clean up temporary directory
+    await fs.rm(tempDir, { recursive: true, force: true });
+
+    console.log('Android files downloaded and copied successfully!');
+  } catch (error) {
+    console.error('Error during setup:', error);
+    // Try to clean up temp directory if it exists
+    try {
+      await fs.rm(tempDir, { recursive: true, force: true });
+    } catch (cleanupError) {
+      console.error('Failed to clean up temporary directory:', cleanupError);
+    }
+    process.exit(1);
+  }
+}
+
+runSetup().catch((error) => {
+  console.error('Unhandled error:', error);
+  process.exit(1);
+});