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/sharefiles_test.go

@@ -137,7 +137,7 @@ func TestShareWithShareKeyConfirms(t *testing.T) {
 	}
 	root := cloneWith(t, map[string]string{
 		".env":              "A=1\n",
-		".lazysecrets.yaml": "share:\n  key: https://" + kv + "/secrets/db-password\n",
+		".lazysecrets.yaml": "sharing:\n  key: https://" + kv + "/secrets/db-password\n",
 	})
 	clip := &fakeClipboard{}
 	d := newDriverOpts(t, Options{Clipboard: clip, ShareRules: demoRules}, fake.Azure(0), repo.New(repo.Settings{Dir: root}))