Some default styles are missing from mash.css

[megoth]

In one of the newer iterations we introduced reset.css which strips a lot of default styles. This might've been a bit too much, as headers now look like any other text.

I suggest we either:

1. Remove the use of reset.css altogether, or a subset of the styles we do not want to use, or
2. Apply some styles we want to have as a common baseline, at least for headers

We might also postpone this until we have a proper solution for how we want to handle styles in the data browser in general.

[Vinnl]

I'd postpone this to be part of the UX work we should incorporate in our planning process later; the current data browser doesn't have a clear information hierarchy anyway.

[Vinnl]

Btw, quick fix might be: https://necolas.github.io/normalize.css/ instead of a reset.

[Vinnl]

Fixed by #68.