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/links.go

@@ -158,7 +158,7 @@ func (m *Model) copyFromRef(r ref.Ref) tea.Cmd {
 		m.flash = flash{text: "copy: no account or profile for " + describeRef(r), isErr: true}
 		return nil
 	}
-	ctx, req := m.begin(slotCopy)
+	ctx, req := m.begin(slotCopy, r.Kind)
 	m.flash = flash{text: "copying " + r.Name + "…"}
 	return func() tea.Msg {
 		var errs []error