refactor: simplify configuration endpoint with JSON serialization (#4159)

* refactor(config): reorganize configuration handling

Signed-off-by: Deluan <deluan@navidrome.org>

* refactor(aboutUtils): improve array formatting and handling in TOML conversion

Signed-off-by: Deluan <deluan@navidrome.org>

* refactor(aboutUtils): add escapeTomlKey function to handle special characters in TOML keys

Signed-off-by: Deluan <deluan@navidrome.org>

* fix(test): remove unused getNestedValue function

* fix(ui): apply prettier formatting

---------

Signed-off-by: Deluan <deluan@navidrome.org>

ui/src/dialogs/AboutDialog.jsx

@@ -23,7 +23,7 @@ import { INSIGHTS_DOC_URL } from '../consts.js'
 import subsonic from '../subsonic/index.js'
 import { Typography } from '@material-ui/core'
 import TableHead from '@material-ui/core/TableHead'
-import { configToToml, separateAndSortConfigs } from '../utils/toml'
+import { configToToml, separateAndSortConfigs } from './aboutUtils'
 
 const useStyles = makeStyles((theme) => ({
   configNameColumn: {