Move Secrets into the Components folder

Continue grouping the standalone modules under Components. Updates the
Secrets.swift references in the app, NSE and Share Extension targets along
with the SwiftLint, SwiftFormat, gitignore, post-checkout hook and forking
documentation paths.

Components/Secrets/Secrets.pkl

@@ -0,0 +1,25 @@
+//
+// Copyright 2025 New Vector Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+// Please see LICENSE files in the repository root for full details.
+//
+
+// Analytics and Diagnostics
+
+import "package://pkg.pkl-lang.org/github.com/element-hq/pkl-tools/staticcode@1.1.0#/StaticCode.pkl"
+
+sentryDSN: String? = read?("env:SENTRY_DSN")
+sentryRustDSN: String? = read?("env:SENTRY_RUST_DSN")
+postHogHost: String? = read?("env:POSTHOG_HOST")
+postHogAPIKey: String? = read?("env:POSTHOG_API_KEY")
+rageshakeURL: String? = read?("env:RAGESHAKE_URL")
+mapLibreAPIKey: String? = read?("env:MAPLIBRE_API_KEY")
+
+output {
+  renderer = new StaticCode.Renderer {
+    language = "Swift"
+    objectName = "Secrets"
+    isolation = "nonisolated"
+  }
+}