bpython: add page

pages/common/bpython.md

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+# bpython
+
+> A fancy interface to the Python interpreter.
+> Provides syntax highlighting and many other nice-to-haves in REPL mode.
+> More information: <https://docs.bpython-interpreter.org/en/latest/>.
+
+- Start a REPL (interactive shell):
+
+`bpython`
+
+- Execute a specific Python file:
+
+`bpython {{path/to/file.py}}`
+
+- Execute a specific Python file and start a REPL:
+
+`bpython --interactive {{path/to/file.py}}`
+
+- Use the specified [c]onfig file instead of the default config:
+
+`bpython --config {{path/to/file.conf}}`