fix: mobile doc site nav cut off

[davidstackio]

🐛 The bug

2 issues with the page navigation drawer on mobile (android chrome):

1. It is cut off from the left side of the screen.
2. It does not scroll vertically so bottom nav items cannot be accessed.

Mobile screenshot:

🛠️ To reproduce

https://nuxtseo.com/docs/robots/guides/robots-txt

🌈 Expected behavior

The nav drawer shouldn't be cut off and should scroll correctly.

ℹ️ Additional context

No response