docs: Fix default location of documents

(same directory as config file, not another subdirectory)

Author: dannyadair

docs/configuration.md

@@ -33,7 +33,7 @@ At least `documents` has to be specified.
 | `directories.base` **readonly** | string  | directory containing the config file | Other directories are relative to this base directory.                                                                                                                                                                                                                  |
 | `directories.build`             | string  | `"build"`                            | Intermediary SVG and PDF files are written here. Deleted unless `bake` is run with `--keep-build`                                                                                                                                                                       |
 | `directories.dist`              | string  | `"dist"`                             | Final PDF files are written here.                                                                                                                                                                                                                                       |
-| `directories.documents`         | string  | `"documents"`                        | Location of document configurations.                                                                                                                                                                                                                                    |
+| `directories.documents`         | string  | `"."`                                | Location of document configurations.                                                                                                                                                                                                                                    |
 | `directories.images`            | string  | `"images"`                           | Location of image files.                                                                                                                                                                                                                                                |
 | `directories.pages`             | string  | `"pages"`                            | Location of page configurations.                                                                                                                                                                                                                                        |
 | `directories.templates`         | string  | `"templates"`                        | Location of SVG template files.                                                                                                                                                                                                                                         |