Allow the user to use the system font for the GUI.

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Is your feature request related to a problem? Please describe.

My friends who have dyslexia have expressed that they'd like to use the font that they use for the machines in the websites that they visit without braking them, although I must note that they don't particularly mind the one that Nextcloud currently provides. For me, this is problematic because I see no reason why Nextcloud should mandate its own font instead of the system/browser-provided one.

Describe the solution you'd like

(Allow the user to) use the browser-provided typeface, ideally by default.

Describe alternatives you've considered

Allow the user to choose the font from a combination box, of which 3 of the options are sans-serif, serif, and monospace, thereby allowing the user to use the browser-provided fonts for those standard aliases.

Additional context

https://help.nextcloud.com/t/85305/2?u=rokejulianlockhart isn't correct, at least for https://wim.nl.tab.digital.

The issue names no files, tests, or entry points. Start by locating the GUI typography styles and any existing font configuration, then determine where the browser-provided typeface can be enabled. Done means users can use the system or browser font as requested, with the behavior covered by an appropriate test or verification.