Fix up GitHub files related to TypeScript SDK (#2943)

Co-authored-by: Zeke Foppa <bfops@users.noreply.github.com>

Author: bfops

.changeset/config.json

@@ -2,7 +2,7 @@
   "$schema": "https://unpkg.com/@changesets/config@3.0.2/schema.json",
   "changelog": [
     "@changesets/changelog-github",
-    { "repo": "clockworklabs/spacetimedb-typescript-sdk" }
+    { "repo": "clockworklabs/SpacetimeDB" }
   ],
   "commit": false,
   "fixed": [],

.github/pull_request_template.md

@@ -1,3 +1,7 @@
+# Migration note
+
+We are in the process of moving from the `spacetimedb-typescript-sdk` repo to the `sdks/typescript` subdirectory of [SpacetimeDB](https://github.com/clockworklabs/SpacetimeDB). **Any new changes should be made there**. The `spacetimedb-typescript-sdk` repo will only be updated on release. Apologies in advance for any sharp edges while the migration is in progress.
+
 # Notes for maintainers
 
 The directory `packages/sdk/src/client_api` is generated from [the SpacetimeDB client-api-messages](https://github.com/clockworklabs/SpacetimeDB/tree/master/crates/client-api-messages).

.github/spacetimedb-version.txt

@@ -1,3 +1,3 @@
 `@clockworklabs/spacetimedb-sdk` is a TypeScript SDK for SpacetimeDB.
 
-Source code can be found here on [GitHub](https://github.com/clockworklabs/spacetimedb-typescript-sdk/blob/main/packages/sdk).
+Source code can be found here on [GitHub](https://github.com/clockworklabs/SpacetimeDB/blob/master/sdks/typescript/packages/sdk).