Dashboard heading changes based on input data type instead of staying constant

[Ttheegela]

Describe the bug
The dashboard heading reflected the data title (e.g. the experiment folder name or confidence mode label) instead of staying as a consistent "FACTS Plotting Dashboard" heading across all data modes.

Root cause
The desc_head Div was being set from the --title argument or derived from the input data, so it changed depending on how the script was invoked.

Fix
Heading hardcoded to "FACTS Plotting Dashboard" regardless of input data or title argument.

Fixed in
Commit d3a08d1

[Ttheegela]

Fixed in commit d3a08d1 dashboard title is now set once from the -title argument (or a sensible default) at generation time and does not change based on the selected scenario or input mode.