Change <Link/> and <NavLink/> to <A/>, and update router example

TODO.md

@@ -1,33 +0,0 @@
-- [ ] Async
-  - [x] Resource
-  - [x] Suspense
-  - [x] Transitions
-  - [ ] Tests for Suspense/Transitions
-  - [ ] Bugs in Suspense/Transitions
-    - [ ] let render effects that _aren't_ under the transition continue running
-- [ ] SSR
-  - [x] SSR
-  - [x] Hydration
-  - [x] Streaming HTML from server
-  - [x] Streaming `Resource`s
-  - [ ] Escaping HTML entities when doing SSR
-  - [ ] Isomorphic rendering benchmark
-  - [ ] Get hydration working properly with SSR/streaming HTML
-- [ ] Server functions
-- [ ] `<Meta/>`, `<Style/>`, `<Link/>`
-- [ ] Docs (and clippy warning to insist on docs)
-- [ ] Router example
-  - [ ] Styling and formatting
-  - [ ] Get transitions working
-- [ ] Read through + understand...
-  - [ ] `Props` macro
-  - [ ] `component` macro
-  - [ ] renderer
-  - [ ] array reconciliation (bundle size?)
-- Reactive system improvements
-  - [ ] Scheduling effects/run effects at end of render
-  - [ ] `batch()`
-- [ ] Scoped CSS
-- [ ] Portals
-- [ ] Loaders
-- [ ] Tutorials + website