add pie chart layout to language card (anuraghazra#2099)

* add pie chart layout to language card

* resolve failing top-lang card tests

* scale down pie chart

* update readme.md

* Update readme.md

Co-authored-by: Rick Staa <rick.staa@outlook.com>

* style: format code

* update donut layout to be created without dependencies

* minor update

* style: format readme

* resolve failing tests

* refactor: clean up code and add extra tests

This commit cleans up the pie chart generation code and adds additional
tests.

* feat: improve pie chart positioning

* rename layout pie to donut

* add animation to donut layout

* refactor: rename pie and doughnut to donut

* feat: decrease donus animation delay

---------

Co-authored-by: rickstaa <rick.staa@outlook.com>

Author: 2 people

package-lock.json

@@ -423,6 +423,14 @@ You can use the `&layout=compact` option to change the card design.
 [![Top Langs](https://github-readme-stats.vercel.app/api/top-langs/?username=anuraghazra&layout=compact)](https://github.com/anuraghazra/github-readme-stats)
 ```
 
+### Donut Chart Language Card Layout
+
+You can use the `&layout=donut` option to change the card design.
+
+```md
+[![Top Langs](https://github-readme-stats.vercel.app/api/top-langs/?username=anuraghazra&layout=donut)](https://github.com/anuraghazra/github-readme-stats)
+```
+
 ### Hide Progress Bars
 
 You can use the `&hide_progress=true` option to hide the percentages and the progress bars (layout will be automatically set to `compact`).
@@ -439,6 +447,10 @@ You can use the `&hide_progress=true` option to hide the percentages and the pro
 
 [![Top Langs](https://github-readme-stats.vercel.app/api/top-langs/?username=anuraghazra&layout=compact)](https://github.com/anuraghazra/github-readme-stats)
 
+-   Donut Chart layout
+
+[![Top Langs](https://github-readme-stats.vercel.app/api/top-langs/?username=anuraghazra&layout=donut)](https://github.com/anuraghazra/github-readme-stats)
+
 -   Hidden progress bars
 
 [![Top Langs](https://github-readme-stats.vercel.app/api/top-langs/?username=anuraghazra&hide_progress=true)](https://github.com/anuraghazra/github-readme-stats)