[model_cards] Link to ExBERT visualisation

Hat/tip @bhoov @HendrikStrobelt @sebastianGehrmann

Also cc @srush and @thomwolf

model_cards/albert-base-v1-README.md

+---
+tags:
+- exbert
+---
+
+[![ExBERT](https://img.shields.io/badge/Visualize%20Attentions-ExBERT-green)](https://huggingface.co/exbert/?model=albert-base-v1)

model_cards/albert-xxlarge-v2-README.md

+---
+tags:
+- exbert
+---
+
+[![ExBERT](https://img.shields.io/badge/Visualize%20Attentions-ExBERT-green)](https://huggingface.co/exbert/?model=albert-xxlarge-v2)

model_cards/bert-base-cased-README.md

+---
+tags:
+- exbert
+---
+
+[![ExBERT](https://img.shields.io/badge/Visualize%20Attentions-ExBERT-green)](https://huggingface.co/exbert/?model=bert-base-cased)

model_cards/bert-base-german-cased-README.md

 ---
 language: german
 thumbnail: https://static.tildacdn.com/tild6438-3730-4164-b266-613634323466/german_bert.png
+tags:
+- exbert
 ---
 
+[![ExBERT](https://img.shields.io/badge/Visualize%20Attentions-ExBERT-green)](https://huggingface.co/exbert/?model=bert-base-german-cased)
+
 # German BERT
 ![bert_image](https://static.tildacdn.com/tild6438-3730-4164-b266-613634323466/german_bert.png)
 ## Overview

model_cards/bert-base-uncased-README.md

+---
+tags:
+- exbert
+---
+
+[![ExBERT](https://img.shields.io/badge/Visualize%20Attentions-ExBERT-green)](https://huggingface.co/exbert/?model=bert-base-uncased)

model_cards/camembert-base-README.md

+---
+language: french
+---
+
 # CamemBERT 
 
 CamemBERT is a state-of-the-art language model for French based on the RoBERTa architecture pretrained on the French subcorpus of the newly available multilingual corpus OSCAR.  

model_cards/distilbert-base-uncased-README.md

+---
+tags:
+- exbert
+---
+
+[![ExBERT](https://img.shields.io/badge/Visualize%20Attentions-ExBERT-green)](https://huggingface.co/exbert/?model=distilbert-base-uncased)

model_cards/distilgpt2-README.md

+---
+tags:
+- exbert
+---
+
+[![ExBERT](https://img.shields.io/badge/Visualize%20Attentions-ExBERT-green)](https://huggingface.co/exbert/?model=distilgpt2)

model_cards/distilroberta-base-README.md

+---
+tags:
+- exbert
+---
+
+[![ExBERT](https://img.shields.io/badge/Visualize%20Attentions-ExBERT-green)](https://huggingface.co/exbert/?model=distilroberta-base)

model_cards/gpt2-README.md

+---
+tags:
+- exbert
+---
+
+[![ExBERT](https://img.shields.io/badge/Visualize%20Attentions-ExBERT-green)](https://huggingface.co/exbert/?model=gpt2)

model_cards/roberta-base-README.md

+---
+tags:
+- exbert
+---
+
+[![ExBERT](https://img.shields.io/badge/Visualize%20Attentions-ExBERT-green)](https://huggingface.co/exbert/?model=roberta-base)

model_cards/xlm-mlm-en-2048-README.md

+---
+tags:
+- exbert
+---
+
+[![ExBERT](https://img.shields.io/badge/Visualize%20Attentions-ExBERT-green)](https://huggingface.co/exbert/?model=xlm-mlm-en-2048)

model_cards/xlm-roberta-base-README.md

+---
+tags:
+- exbert
+---
+
+[![ExBERT](https://img.shields.io/badge/Visualize%20Attentions-ExBERT-green)](https://huggingface.co/exbert/?model=xlm-roberta-base)