brittany: add page (#8597)

pages/common/brittany.md

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+# brittany
+
+> Pretty-print Haskell source files.
+> More information: <https://github.com/lspitzner/brittany#readme>.
+
+- Format a Haskell source file and print the result to stdout:
+
+`brittany {{path/to/file.hs}}`
+
+- Format all Haskell source files in the current directory in-place:
+
+`brittany --write-mode=inplace {{*.hs}}`
+
+- Check whether a Haskell source file needs changes and indicate the result through the programme's exit code:
+
+`brittany --check-mode {{path/to/file.hs}}`
+
+- Format a Haskell source file using the specified amount of spaces per indentation level and line length:
+
+`brittany --indent {{4}} --columns {{100}} {{path/to/file.hs}}`
+
+- Format a Haskell source file according to the style defined in the specified config file:
+
+`brittany --config-file {{path/to/config.yaml}} {{path/to/file.hs}}`