Update README.md

**Dataset Moved**

**This dataset is now hosted by the Mozilla Data Collective.** Please use the official link below for the most up-to-date version:
https://datacollective.mozillafoundation.org/datasets/cmkwuye570028mo074bppsmiw

**Description**

This dataset is a clean, ready-to-use collection of 6,369 books sourced from openbook.gr.
The raw text has been processed using the glossapi pipeline to remove site artifacts and standardize the content into clean Markdown, making it suitable for immediate NLP tasks and linguistic analysis.

README.md

@@ -1,3 +1,12 @@
----
-license: cc
----
+---
+license: cc-by-nc-sa-4.0
+language:
+- el
+tags:
+- NLP
+- BOOKS
+- OPENDATA
+pretty_name: O
+size_categories:
+- 1K<n<10K
+---