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>

docs/keys.md

@@ -65,8 +65,8 @@ certificates as their subject, issuer, dates, names and thumbprint, with
 any other PEM block (a private key) named but not shown. `y` still copies
 it exactly as stored.
 
-A revealed value hides again after `revealTimeout` (60s) and when the
-terminal loses focus (`hideOnBlur`); see [config](config.md).
+A revealed value hides again after `values.revealTimeout` (60s) and
+when the terminal loses focus (`values.hideOnBlur`); see [config](config.md).
 
 ## Stars and notes