added script to generate diff table for PRs.

Switch to using the standards format (requirements.txt) for Python deps.

README.md

@@ -11,7 +11,7 @@ To edit and develop locally install the following packages and run the built in
 ```bash
 python3 -m venv env
 source env/bin/activate
-pip install mkdocs-material mkdocs-git-revision-date-localized-plugin mkdocs-awesome-pages-plugin mkdocs-minify-plugin
+pip install -r requirements.txt
 mkdocs serve
 ```
 

docs/index.md

@@ -85,7 +85,7 @@ Doing specific tasks: concepts, methods, ideas:
 | ------------------------------------------------ | ---------------------------------------------------------------- |
 | **Grouping**                                     |                                                                  |
 | `{ ...; }`                                       | [command grouping](syntax/ccmd/grouping_plain.md)                  |
-| `( ... .md)`                                        | [command grouping in a subshell](syntax/ccmd/grouping_subshell.md) |
+| `( ... )`                                        | [command grouping in a subshell](syntax/ccmd/grouping_subshell.md) |
 | **Conditionals**                                 |                                                                  |
 | `[[ ... ]]`                                      | [conditional expression](syntax/ccmd/conditional_expression.md)    |
 | `if ...; then ...; fi`                           | [conditional branching](syntax/ccmd/if_clause.md)                  |

requirements.txt

@@ -0,0 +1,4 @@
+mkdocs-material
+mkdocs-git-revision-date-localized-plugin
+mkdocs-awesome-pages-plugin
+mkdocs-minify-plugin