outline: NOTES.txt and the exponential-quantity fix (7.1.0+up1.9.2)

Part of #157: multiplyQuantity turned a bare integer resource value into
exponential notation and aborted the render. The null-safe helpers pass
values through fromYaml, which makes every number a float64, and Go's "%v"
switches float64 to exponential form from about 1e6 upwards - so
"1048576" arrived as "1.048576e+06" and the suffix check failed. A new
outline.formatNumber helper renders such a value as a plain decimal
string; it is applied to the input and to the non-integer product. This is
the canonical fix agreed for the issue, taken over unchanged so the copies
of the helper in all charts stay identical.

Part of #43: the chart gets a NOTES.txt. It renders the access URL (or the
port-forward command when the Ingress is off), lists the fields each of the
three 1Password items has to carry plus the OIDC redirect URI, and states
the traps that are otherwise found the hard way: editing a value inside a
1Password item restarts nothing, Postgres and Redis are external and
unencrypted by default, migrations run inside the startup probe's budget,
uploads sit on a single RWO volume that helm uninstall takes with it, the
Ingress body-size limit is ten times smaller than the app's, and the chart
configures no mail at all.

Minor bump: the fix changes no rendered output for any value the schema
accepted before, and a NOTES.txt renders no object.

outline/Chart.yaml

@@ -5,7 +5,7 @@ icon: https://raw.githubusercontent.com/outline/outline/main/public/images/icon-
 
 type: application
 
-version: 7.0.0+up1.9.2
+version: 7.1.0+up1.9.2
 appVersion: 1.9.2
 
 maintainers: