Implement Figure.pygmtlogo for the PyGMT logo

doc/api/index.rst

@@ -35,6 +35,7 @@ Plotting figure elements
     Figure.logo
     Figure.magnetic_rose
     Figure.paragraph
+    Figure.pygmtlogo
     Figure.scalebar
     Figure.solar
     Figure.text

pygmt/figure.py

@@ -30,6 +30,7 @@
 from pygmt.src.plot import plot as _plot
 from pygmt.src.plot3d import plot3d as _plot3d
 from pygmt.src.psconvert import psconvert as _psconvert
+from pygmt.src.pygmtlogo import pygmtlogo as _pygmtlogo
 from pygmt.src.rose import rose as _rose
 from pygmt.src.scalebar import scalebar as _scalebar
 from pygmt.src.shift_origin import shift_origin as _shift_origin
@@ -464,6 +465,7 @@ def _repr_html_(self) -> str:
     plot = _plot
     plot3d = _plot3d
     psconvert = _psconvert
+    pygmtlogo = _pygmtlogo
     rose = _rose
     scalebar = _scalebar
     set_panel = _set_panel