feat: config grouped by area, with per-provider timeouts and an update interval (#60)

Regroups the config, while there are no users to migrate:

- `ui`: icons, sourcesView, collapseGroups, loadDelay, expiryWarningDays
- `values`: revealTimeout, hideOnBlur, clipboardClear
- `storage`: cache, history
- `updates`: autoCheck (was updateCheck), autoCheckInterval (new, 24h by default), updateSources (was releases)
- `providers.timeout` (was timeout), plus `timeout` on azure, databricks and repos overriding it for that provider; `--timeout` still sets them all
- `sharing` (was share), in the config and in a repo's `.lazysecrets.yaml`

docs/config.md and the pages naming these keys are updated.

Reviewed-on: #60
Co-authored-by: Karl-Einar Bergstrøm <karl-einarb@outlook.com>

internal/ui/app/commands.go

@@ -165,7 +165,7 @@ func (m *Model) runCommand(c commands.Command, rendered string, obj *provider.Ob
 	o := *obj
 	p := m.providerFor(o.Container.Source)
 	m.flash = flash{text: "fetching " + o.Name + " for " + c.Description + "…"}
-	timeout := m.timeout
+	timeout := m.timeout.of(o.Container.Source.Kind)
 	m.usedObject(o)
 	return func() tea.Msg {
 		ctx, cancel := context.WithTimeout(context.Background(), timeout)