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/azure.md

@@ -63,7 +63,7 @@ Secrets, keys and certificates, each on their own tab of the Secrets pane
 (`[`/`]`). `space` reveals a secret's value, or the public material of a
 key (PEM public key) or certificate; private key material is never
 fetched. `v` lists an item's versions. Items expiring within
-`expiryWarningDays` (30 by default) are marked `⚠ 12d`, expired ones `✗`.
+`ui.expiryWarningDays` (30 by default) are marked `⚠ 12d`, expired ones `✗`.
 
 The status pane (`0`) lists them across every vault loaded, opened or
 cached, soonest first, and its line counts them (`⚠ 3 expiring`); `enter`