Minor changes in section: Books (english) - Python - Pandas (#5432)

* Remove "in process note" of Python Pandas

- Remove the in "process note" in Books - English - Python - Pandas. It always points to last version.

Fixes EbookFoundation/free-programming-books#5431

* Split Python Pandas entry into online+html+pdf

- Split entry at Books - English - Python - Pandas into online+html+pdf

Fixes EbookFoundation/free-programming-books#5431

* Split Python Pandas entry into online+html+pdf

- Fix Pull Request CI/CD errors.
- Split entry at Books - English - Python - Pandas into online+html+pdf

Fixes EbookFoundation/free-programming-books#5431

* Join previous split about Python Pandas book

- Join the previous split entry (online+html+pdf) at "Books - English - Python - Pandas" into one single record

Fixes EbookFoundation/free-programming#5431

* Join previous split about Python Pandas book

- Fix CI/CD errors.
- Join the previous split entry (online+html+pdf) at "Books - English - Python - Pandas" into one single record.

Fixes EbookFoundation/free-programming#5431

books/free-programming-books.md

@@ -2575,7 +2575,7 @@ Kerridge (PDF) (email address *requested*, not required)
 #### Pandas
 
 * [Learn Pandas](https://bitbucket.org/hrojas/learn-pandas) - Hernan Rojas (0.18.1)
-* [pandas: powerful Python data analysis toolkit](https://pandas.pydata.org/docs/pandas.pdf) - Wes McKinney and the Pandas Development Team (:construction: *in process*) (PDF)
+* [pandas: powerful Python data analysis toolkit](https://pandas.pydata.org/docs) - Wes McKinney and the Pandas Development Team (HTML, PDF)
 
 
 #### Pyramid