linting: fix typos, add toml validation (#7007)

- adds the `toml` plugin to the `eslint` linting → expect to have `options/setting/config.toml` by #6862
- fixes `make lint-codespell` commands
- related concerning `codespell`: #3270
- info: codespell check is and was not activated in the workflows (could maybe, runs only few seconds on my system)

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7007
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: Robert Wolff <mahlzahn@posteo.de>
Co-committed-by: Robert Wolff <mahlzahn@posteo.de>

services/repository/gitgraph/graph_models.go

@@ -199,7 +199,7 @@ func NewCommit(row, column int, line []byte) (*Commit, error) {
 	if len(data) < 5 {
 		return nil, fmt.Errorf("malformed data section on line %d with commit: %s", row, string(line))
 	}
-	// Format is a slight modifcation from RFC1123Z
+	// Format is a slight modification from RFC1123Z
 	t, err := time.Parse("Mon, _2 Jan 2006 15:04:05 -0700", string(data[2]))
 	if err != nil {
 		return nil, fmt.Errorf("could not parse date of commit: %w", err)