Merge Forecast into Live, four tabs; state solo-project policy

The Live tab now carries the observed-and-forecast chart (a superset of the
old rolling window, which plotted the same observed series without the
prediction) and the precipitation panel. Estimator internals moves to Models,
beside the calibration input that sets the coefficient it reports. The seven
day outlook moves to History. Verified in Chromium at 1600x900: all four tabs
scrollHeight 900 against innerHeight 900, zero clipped elements outside
internal scrollers, zero console errors.

CONTRIBUTING.md now states plainly that this is a solo project: bug reports
welcome, pull requests unlikely to be merged, fork it instead. No other
developer was ever named anywhere in the repository.

ashvale/methods.py

@@ -221,7 +221,7 @@ def pipeline(cfg) -> List[Dict[str, Any]]:
                        "label abstains in the ambiguous middle rather than "
                        "guessing, because a poisoned training set costs more than "
                        "the extra samples buy. Trust grows as n/(n+25) in strong "
-                       "labels, so the two buttons on the Forecast tab matter.",
+                       "labels, so the two buttons on the Live tab matter.",
             "params": {"prior": "Zambretti, three-branch",
                        "learner": "logistic, AdaGrad",
                        "strong label weight": "10x proxy"},