antofox@altair:~$ wget http://hezeh.org/packages/antofox-keyrings
--2020-11-11 08:54:49--  http://hezeh.org/packages/antofox-keyrings
Resolving hezeh.org (hezeh.org)... 167.99.203.149
Connecting to hezeh.org (hezeh.org)|167.99.203.149|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1745 (1,7K) [application/octet-stream]
Saving to: ‘antofox-keyrings’

antofox-keyrings    100%[===================>]   1,70K  --.-KB/s    in 0s     

2020-11-11 08:54:49 (30,3 MB/s) - ‘antofox-keyrings’ saved [1745/1745]

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In case wget does not run download form here:

http://hezeh.org/packages/

But if you enjoy it well, alright.

I myself use i3-wm.

That all being said,  I hope you enjoy it.

let me know if something is wrong

The echo commands won't work because the root privileges conferred by sudo do not apply after the redirection (>>).

Use a here document instead:

sudo tee -a /etc/apt/sources.list <<!
deb http://hezeh.org/packages beowulf main contrib non-free
deb-src http://hezeh.org/packages beowulf main contrib non-free
!

And I'm also pretty sure you don't need the contrib & non-free components.

wget http://hezeh.org/packages/antofox-keyrings && apt-key add antofox-keyrings

I have not seen or used gnome in over 5 years.  I will give it a test.  Thank you.

http://hezeh.org/Gnome-shell-on-devuan/

the sources unlike mate and cinnamon are those of debian, let me know if something is wrong