docs: Fix typo on Welcome page

Signed-off-by: Sietze van Buuren <[email protected]>

docs/index.md

@@ -1,8 +1,7 @@
 # Welcome to mlpyqtgraph's documentation!
 
 mlpyqtgraph enables [matplotlib](https://matplotlib.org/)-like plotting with
-|[pyqtgraph](https://github.com/pyqtgraph/pyqtgraph) in existing
-python programs.
+[pyqtgraph](https://github.com/pyqtgraph/pyqtgraph) in existing python programs.
 
 Please refer to the [](introduction) for a brief explanation of mlpyqtgraph or
 read the [getting started](getting_started) to try mlpyqtgraph out right away.