Better docs search (#4015)

Search through the keywords of an article as well as the text. This
ensures that relevant examples show up for people using the search
feature.

### Change Type

<!-- ❗ Please select a 'Scope' label ❗️ -->

- [ ] `sdk` — Changes the tldraw SDK
- [ ] `dotcom` — Changes the tldraw.com web app
- [x] `docs` — Changes to the documentation, examples, or templates.
- [ ] `vs code` — Changes to the vscode plugin
- [ ] `internal` — Does not affect user-facing stuff

<!-- ❗ Please select a 'Type' label ❗️ -->

- [ ] `bugfix` — Bug fix
- [ ] `feature` — New feature
- [x] `improvement` — Improving existing features
- [ ] `chore` — Updating dependencies, other boring stuff
- [ ] `galaxy brain` — Architectural changes
- [ ] `tests` — Changes to any test code
- [ ] `tools` — Changes to infrastructure, CI, internal scripts,
debugging tools, etc.
- [ ] `dunno` — I don't know


### Test Plan

1. Search for 'camera'
2. examples such as pdf annotator and image annotator now display

### Release Notes

- Improves the docs search by searching through keywords

apps/docs/app/api/search/route.ts

@@ -36,14 +36,15 @@ export async function GET(req: NextRequest) {
 		const db = await getDb()
 		const searchForArticle = await db.db.prepare(
 			`
-	SELECT id, title, sectionId, categoryId, content
+	SELECT id, title, sectionId, categoryId, content, keywords
 	FROM ftsArticles
-	WHERE ftsArticles MATCH ?
+	WHERE ftsArticles MATCH ? OR keywords MATCH ?
 	ORDER BY bm25(ftsArticles, 1000.0)
 `,
-			query
+			[query, query]
 		)
 
+
 		await searchForArticle.all().then(async (queryResults) => {
 			for (const article of queryResults) {
 				const section = await db.getSection(article.sectionId)