DT-6006: font fix

[Dvun]

Proposed Changes

• The Roboto font turned out to be too pale, so changed it to the montserrat font only

Pull Request Check List

• A reasonable set of unit tests is included
• Console does not show new warnings/errors
• Changes are documented or they are self explanatory
• This pull request does not have any merge conflicts
• All existing tests pass in CI build
• Code coverage does not decrease (unless measured incorrectly)

Review

• Read and verify the code changes
• Test the functionality by running the UI locally with all popular browsers available in your platform
• Check that the implementation matches the design, when such one is defined in a Jira issue
• Merge the pull request

[vesameskanen]

Emme voi vaihtaa koko fonttia noin vain.

Oikea korjaus on tehdä disruptions.scss tyylien alert-body luokan font-weight määrittely muuttujasta riippuvaksi. Oletusarvo on 200, mutta matka.fi teemassa sen arvo pitää olla 400.

https://github.com/HSLdevcom/digitransit-ui/blob/v3/sass/themes/default/_theme.scss
https://github.com/HSLdevcom/digitransit-ui/blob/v3/sass/themes/matka/_theme.scss