Allow histogram x-axis maximum below 1

**Is your feature request related to a problem? Please describe.**
The details of branches with very small values (e.g. eDep in tracking detectors) are lost due to the limits of the xaxis https://github.com/eic/epic-capybara/blob/main/epic_capybara/cli/bara.py#L85. PRs which make changes to these values will be hidden in the reports.

**Describe the solution you'd like**
Allow the x-axis maximum below 1 or scale the data by a powers of 10 and add a label on the axis.