bpython: add page (#15312)

* bpython: add page

* Update pages/common/bpython.md

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

---------

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/common/bpython.md

@@ -0,0 +1,21 @@
+# bpython
+
+> A fancy interface to the Python interpreter.
+> Provides syntax highlighting and many other nice-to-haves in REPL mode.
+> More information: <https://manned.org/bpython>.
+
+- 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}}`