chore: update URLs for v1.0 in README

Signed-off-by: Ryohsuke Mitsudome <ryohsuke.mitsudome@tier4.jp>

README.md

@@ -3,6 +3,6 @@
 - An [Autoware](https://github.com/autowarefoundation/autoware) repository that contains a basic set of high-quality, stable ROS packages for autonomous driving.
 
 - Although this repository is currently empty, porting of code from Universe to Core will begin once the interfaces for Autoware Core/Universe have been finalized, as per ongoing [Autoware Architecture WG](https://github.com/autowarefoundation/autoware/discussions?discussions_q=label%3Aarchitecture_wg) discussions.
-- A more detailed explanation about Autoware Core can be found on the [Autoware concepts documentation page](https://autowarefoundation.github.io/autoware-documentation/main/design/autoware-concepts/#the-core-module).
+- A more detailed explanation about Autoware Core can be found on the [Autoware concepts documentation page](https://autowarefoundation.github.io/autoware-documentation/v1.0/design/autoware-concepts/#the-core-module).
 
 - For researchers and developers who want to extend the functionality of Autoware Core with experimental, cutting-edge ROS packages, see [Autoware Universe](https://github.com/autowarefoundation/autoware.universe).