Implement RU CSS style

[ThijsRU]

• place bootstrap_ru.css in folder DONE

• requirements.txt: django_bootstrap5==24.2 DONE 

• Link naar de CSS in base.html: https://github.com/tsg-humlab/shewrote/blob/8235a80e8625f5eb8d7daca7f3500f486a80ca3d/shewrote/templates/shewrote/base.html#L20 TO DO

[ThijsRU]

Throw the existing stylesheets out of layout.html?

OLD:

werkt het? Zinnig?

[ThijsRU]