fix: broken URLs (#550)

fix the broken URLs of available tasks and metrics. also separately add URLs of custom task and metric.

Author: deep-diver

README.md

@@ -36,7 +36,7 @@ backends—whether it's
 ease. Dive deep into your model’s performance by saving and exploring detailed,
 sample-by-sample results to debug and see how your models stack-up.
 
-Customization at your fingertips: letting you either browse all our existing [tasks](https://github.com/huggingface/lighteval/wiki/Available-Tasks) and [metrics](https://github.com/huggingface/lighteval/wiki/Metric-List) or effortlessly [create your own](https://github.com/huggingface/lighteval/wiki/Adding-a-Custom-Task), tailored to your needs.
+Customization at your fingertips: letting you either browse all our existing [tasks](https://huggingface.co/docs/lighteval/available-tasks) and [metrics](https://huggingface.co/docs/lighteval/metric-list) or effortlessly create your own [custom task](https://huggingface.co/docs/lighteval/adding-a-custom-task) and [custom metric](https://huggingface.co/docs/lighteval/adding-a-new-metric), tailored to your needs.
 
 Seamlessly experiment, benchmark, and store your results on the Hugging Face
 Hub, S3, or locally.