DOC: Inline pgf userdemo examples

They are not too useful as examples, since they need to save `.pgf`
files, which are not scraped nor exposed in any way from the generated
docs.

Author: QuLogic

galleries/examples/userdemo/pgf_fonts.py

@@ -91,6 +91,8 @@
         pdf.savefig(fig2)
 
 
+.. redirect-from:: /gallery/userdemo/pgf_fonts
+
 Font specification
 ==================
 
@@ -107,9 +109,31 @@
 When saving to ``.pgf``, the font configuration Matplotlib used for the
 layout of the figure is included in the header of the text file.
 
-.. literalinclude:: /gallery/userdemo/pgf_fonts.py
-   :end-before: fig.savefig
+.. code-block:: python
+
+    import matplotlib.pyplot as plt
+
+    plt.rcParams.update({
+        "font.family": "serif",
+        # Use LaTeX default serif font.
+        "font.serif": [],
+        # Use specific cursive fonts.
+        "font.cursive": ["Comic Neue", "Comic Sans MS"],
+    })
+
+    fig, ax = plt.subplots(figsize=(4.5, 2.5))
 
+    ax.plot(range(5))
+
+    ax.text(0.5, 3., "serif")
+    ax.text(0.5, 2., "monospace", family="monospace")
+    ax.text(2.5, 2., "sans-serif", family="DejaVu Sans")  # Use specific sans font.
+    ax.text(2.5, 1., "comic", family="cursive")
+    ax.set_xlabel("µ is not $\\mu$")
+
+    fig.tight_layout(pad=.5)
+
+.. redirect-from:: /gallery/userdemo/pgf_preamble_sgskip
 
 .. _pgf-preamble:
 
@@ -122,16 +146,35 @@
 if you want to do the font configuration yourself instead of using the fonts
 specified in the rc parameters, make sure to disable :rc:`pgf.rcfonts`.
 
-.. only:: html
+.. code-block:: python
+
+    import matplotlib as mpl
 
-    .. literalinclude:: /gallery/userdemo/pgf_preamble_sgskip.py
-        :end-before: fig.savefig
+    mpl.use("pgf")
+    import matplotlib.pyplot as plt
+
+    plt.rcParams.update({
+        "font.family": "serif",  # use serif/main font for text elements
+        "text.usetex": True,     # use inline math for ticks
+        "pgf.rcfonts": False,    # don't setup fonts from rc parameters
+        "pgf.preamble": "\n".join([
+             r"\usepackage{url}",            # load additional packages
+             r"\usepackage{unicode-math}",   # unicode math setup
+             r"\setmainfont{DejaVu Serif}",  # serif font via preamble
+        ])
+    })
+
+    fig, ax = plt.subplots(figsize=(4.5, 2.5))
 
-.. only:: latex
+    ax.plot(range(5))
 
-    .. literalinclude:: /gallery/userdemo/pgf_preamble_sgskip.py
-        :end-before: import matplotlib.pyplot as plt
+    ax.set_xlabel("unicode text: я, ψ, €, ü")
+    ax.set_ylabel(r"\url{https://matplotlib.org}")
+    ax.legend(["unicode math: $λ=∑_i^∞ μ_i^2$"])
 
+    fig.tight_layout(pad=.5)
+
+.. redirect-from:: /gallery/userdemo/pgf_texsystem
 
 .. _pgf-texsystem:
 
@@ -143,9 +186,29 @@
 Please note that when selecting pdflatex, the fonts and Unicode handling must
 be configured in the preamble.
 
-.. literalinclude:: /gallery/userdemo/pgf_texsystem.py
-   :end-before: fig.savefig
+.. code-block:: python
+
+    import matplotlib.pyplot as plt
+
+    plt.rcParams.update({
+        "pgf.texsystem": "pdflatex",
+        "pgf.preamble": "\n".join([
+             r"\usepackage[utf8x]{inputenc}",
+             r"\usepackage[T1]{fontenc}",
+             r"\usepackage{cmbright}",
+        ]),
+    })
+
+    fig, ax = plt.subplots(figsize=(4.5, 2.5))
+
+    ax.plot(range(5))
+
+    ax.text(0.5, 3., "serif", family="serif")
+    ax.text(0.5, 2., "monospace", family="monospace")
+    ax.text(2.5, 2., "sans-serif", family="sans-serif")
+    ax.set_xlabel(r"µ is not $\mu$")
 
+    fig.tight_layout(pad=.5)
 
 .. _pgf-troubleshooting: