ptpython, ptpython3: add page (#8125)

pages/common/ptpython.md

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+# ptpython
+
+> A better Python REPL.
+> More information: <https://github.com/prompt-toolkit/ptpython>.
+
+- Start a REPL (interactive shell):
+
+`ptpython`
+
+- Execute a specific Python file:
+
+`ptpython {{path/to/file.py}}`
+
+- Execute a specific Python file and start a REPL:
+
+`ptpython -i {{path/to/file.py}}`
+
+- Open the menu:
+
+`F2`
+
+- Open the history page:
+
+`F3`
+
+- Toggle paste mode:
+
+`F6`
+
+- Quit:
+
+`Ctrl + D`

pages/common/ptpython3.md

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+# ptpython3
+
+> This command is an alias of `ptpython`.
+
+- View documentation for the original command:
+
+`tldr ptpython`