docs: Fix links and typos in documentation

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

docs/examples.md

@@ -1,4 +1,5 @@
 # Examples
 
-Please refer to the [examples](examples) directory for a series of examples that
-illustrate usage of mlpyqtgraph.
+Please refer to the
+[examples](https://github.com/swvanbuuren/mlpyqtgraph/tree/master/examples)
+directory for a series of examples that illustrate usage of mlpyqtgraph.

docs/getting_started.md

@@ -1,13 +1,14 @@
 # Getting started
 
 To get started using mlpyqtgraph, it first needs to be installed. Refer to
-[installation page](Installation) for instructions.
+[installation page](../installation.md) for instructions.
 
 Now, mlpyqtgraph can be used in existing python programs.
 
 To get started, try out the [full
-example](https://github.com/swvanbuuren/mlpyqtgraph/blob/main/examples/full.py)
-from the [mlpyqtgraph examples](examples).
+example](https://github.com/swvanbuuren/mlpyqtgraph/tree/master/examples/full.py)
+from the [mlpyqtgraph
+examples](https://github.com/swvanbuuren/mlpyqtgraph/tree/master/examples).
 
 ```python
 --8<-- "examples/full.py:6"

docs/introduction.md

@@ -1,11 +1,13 @@
 # Introduction
 
 mlpyqtgraph enables [matplotlib](https://matplotlib.org/)-like plotting with
-|[pyqtgraph](https://github.com/pyqtgraph/pyqtgraph) in existing
+[pyqtgraph](https://github.com/pyqtgraph/pyqtgraph) in existing
 python programs.
 
-It accomplishes this, by offering an interface very similar to |matplotlib|,
-while maintaining key |pyqtgraph| features such as speed and interactivity.
+It accomplishes this, by offering an interface very similar to
+[matplotlib](https://matplotlib.org/), while maintaining key
+[pyqtgraph](https://github.com/pyqtgraph/pyqtgraph) features such as speed and
+interactivity.
 
 mlpyqtgraph diverts the existing python program into a dedicated thread, while
 using the main thread solely for plotting with pyqtgraph. This is a [requirement