Link isort profile to Black code style isort mention (#2246)

The isort configuration currently in the Black code style document is
duplicated in Using Black with other tools document. I think it would
be better to consolidate information and simply link to the tool guide,
mentioning the easy profile in the original document.

I changed the link from isort PyPI page to Black's docs on isort
because for users it could be better to see the Black docs on why that
configuration is necessary and what isort is from Black's perspective.

docs/the_black_code_style/current_style.md

@@ -128,29 +128,9 @@ indentation level (like the arguments list and the docstring in the example abov
 If a data structure literal (tuple, list, set, dict) or a line of "from" imports cannot
 fit in the allotted length, it's always split into one element per line. This minimizes
 diffs as well as enables readers of code to find which commit introduced a particular
-entry. This also makes _Black_ compatible with [isort](https://pypi.org/p/isort/) with
-the following configuration.
-
-<details>
-<summary>A compatible `.isort.cfg`</summary>
-
-```cfg
-[settings]
-multi_line_output = 3
-include_trailing_comma = True
-force_grid_wrap = 0
-use_parentheses = True
-ensure_newline_before_comments = True
-line_length = 88
-```
-
-The equivalent command line is:
-
-```
-$ isort --multi-line=3 --trailing-comma --force-grid-wrap=0 --use-parentheses --line-width=88 [ file.py ]
-```
-
-</details>
+entry. This also makes _Black_ compatible with
+[isort](../guides/using_black_with_other_tools.md#isort) with the ready-made `black`
+profile or manual configuration.
 
 ### Line length