Documentation page shows "The Linux Kernel"

Hi Heinrich,

https://u-boot.readthedocs.io/en/latest/

top left corner shows "The Linux Kernel" while previously it was U-Boot

This was introduced by commit:

commit 98f01cf7a22ec81774a26a9e1bf11c7c3cdce424 Author: Heinrich Schuchardt xypron.glpk@gmx.de Date: Thu Dec 31 23:16:46 2020 +0100

doc: update Kernel documentation build system

Update the documentation build system according to Linux v5.11-rc1.

Deactive the automarkup.py extension module which on Gitlab CI is incompatible with Unicode.

With this patch we can build the HTML documentation using either of Sphinx 2 and Sphinx 3.

Would you please take a look?

Regards, Bin