Use main as default landing page

[cicdguy]

Per @barnett11 :

An observation - our documentation now seems to reflect devel, instead of main - is this intentional? We haven't deployed 0.2 yet, is the documentation off main no longer available with this update?
https://pharmaverse.github.io/datacutr/
https://pharmaverse.github.io/datacutr/main/index.html - this used to point to main but fails now?

This should fix it.

[github-actions]

Package	Line Rate	Health
datacutr	100%	✔
Summary	100% (461 / 462)	✔