Release 0.2.21; track the StartOS version files

Cut version 0.2.21 (current = v_0_2_21) with the adjudicated DO-item fixes.
Also commits the previously-untracked v_0_2_* version files that
versions/index.ts imports (ROADMAP item D2), so a fresh checkout builds
without dangling imports. The missing v_0_2_2 is intentional (versions are
an unordered set).

Built and verified: ten31portal_x86_64.s9pk packs cleanly at 0.2.21:0,
arch x86_64, SDK 0.4.0.

deploy/startos/install/versions/v_0_2_11.ts

@@ -0,0 +1,14 @@
+import { VersionInfo } from '@start9labs/start-sdk'
+
+export const v_0_2_11 = VersionInfo.of({
+  version: '0.2.11:0',
+  releaseNotes: {
+    en_US:
+      'Linked investor logins: an investor who invests under several names (e.g. an IRA and a trust, or through different Partners) can be given one sign-on that shows every name\'s investments together, labeled by name. Set it in Users → Manage → Login. Also: sortable columns on the Entities view.',
+  },
+  migrations: {
+    // Adds users.primary_account_id; applied by Alembic on startup.
+    up: async ({ effects }) => {},
+    down: async ({ effects }) => {},
+  },
+})