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/links.md

@@ -54,7 +54,7 @@ uses it) or your config (for repos that don't name one), by its
 reference:
 
 ```yaml
-share:
+sharing:
   key: https://kv-team.vault.azure.net/secrets/env-share
 ```
 
@@ -67,7 +67,7 @@ isn't long and varied enough, saying how (never showing it). By default
 that's 32 characters of two kinds; your config can ask for more, or less:
 
 ```yaml
-share:
+sharing:
   keyRules:
     minLength: 32    # characters; 16 at least
     minClasses: 2    # kinds of character: lowercase, uppercase, digits, symbols