Correct licensing: GNU Free Documentation License 1.2.

As can be verified using http://archive.org to view old copies of the website, the wiki content was licensed under the "GNU Free Documentation License 1.2." http://www.gnu.org/licenses/old-licenses/fdl-1.2.html (since superceded by v1.3), e.g.

* https://web.archive.org/web/20060613062104/http://biopython.org:80/wiki/Main_Page (oldest)
* https://web.archive.org/web/20160330125201/http://biopython.org:80/wiki/Main_Page (most recent)

We'd need to check with the contributors since the GitHub migration, and then update the new template here which currently says "All rights reserved.":
https://github.com/biopython/biopython.github.io/blob/master/_includes/sidebar.html#L51

Reported by @hlapp by email.

Empieza por _includes/sidebar.html en la línea referenciada y compara el texto de licencia actual con las copias archivadas de Main_Page enlazadas en el issue. Antes de cambiarlo, consulta con los colaboradores como se ha solicitado; se considerará hecho cuando la barra lateral refleje la versión confirmada de la GNU Free Documentation License en lugar de “All rights reserved.”

Escrito por el modelo de indexación a partir del texto del issue.