create-app: Update techdocs-backend, add changesets

.changeset/curly-emus-own.md

@@ -0,0 +1,6 @@
+---
+'@backstage/create-app': patch
+---
+
+techdocs-backend: Simplified file, removing individual preparers and generators.
+techdocs-backend: UrlReader is now available to use in preparers.

.changeset/thirty-papayas-attack.md

@@ -0,0 +1,36 @@
+---
+'@backstage/techdocs-common': minor
+'@backstage/plugin-techdocs-backend': minor
+---
+
+In your Backstage app, `packages/backend/plugins/techdocs.ts` file has now been simplified,
+to remove registering individual preparers and generators.
+
+Please update the file when upgrading the version of `@backstage/plugin-techdocs-backend` package.
+
+```typescript
+const preparers = await Preparers.fromConfig(config, {
+  logger,
+  reader,
+});
+
+const generators = await Generators.fromConfig(config, {
+  logger,
+});
+
+const publisher = await Publisher.fromConfig(config, {
+  logger,
+  discovery,
+});
+```
+
+You should be able to remove unnecessary imports, and just do
+
+```typescript
+import {
+  createRouter,
+  Preparers,
+  Generators,
+  Publisher,
+} from '@backstage/plugin-techdocs-backend';
+```