Change font size of inputs to 1rem on mobile
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=469418) </details> <!--IssueSummary end--> To reproduce: 1. On a mobile device or in a simulated iPhone in the Simulator app on macOS, tap a text field to focus it 2. When the text field focuses, the mobile browser will zoom in, because the font size of the input is < 16px/1rem Recommended interventions: 1. We should use `font-size: 1rem;` for all `input`s and `textarea`s on mobile devices. This is a broad solution that is outside the scope of ~"group::product planning" and needs ~Pajamas team alignment
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