Add youtube links on landing and overview pages (#3977)

Co-authored-by: Dongdong Tian <[email protected]>
Co-authored-by: Yvonne Fröhlich <[email protected]>

Author: 3 people

README.md

@@ -30,7 +30,7 @@ Afterwards, feel free to look at our [Tutorials](https://www.pygmt.org/latest/tu
 visit the [Gallery](https://www.pygmt.org/latest/gallery), and check out some
 [external PyGMT examples](https://www.pygmt.org/latest/external_resources.html)!
 
-![Quick Introduction to PyGMT YouTube Video](https://raw.githubusercontent.com/GenericMappingTools/pygmt/refs/heads/main/doc/_static/scipy2022-youtube-thumbnail.jpg)
+[![Quick Introduction to PyGMT YouTube Video](https://raw.githubusercontent.com/GenericMappingTools/pygmt/refs/heads/main/doc/_static/scipy2022-youtube-thumbnail.jpg)](https://www.youtube.com/watch?v=4iPnITXrxVU)
 
 ## About
 

doc/overview.md

@@ -44,9 +44,10 @@ These are conference presentations about the development of PyGMT (previously "G
     2022.
     Max Jones, Wei Ji Leong, and Leonardo Uieda.
     Presented at *SciPy 2022*.
-    doi:[10.6084/m9.figshare.20483793](https://doi.org/10.6084/m9.figshare.20483793)
+    doi:[10.6084/m9.figshare.20483793](https://doi.org/10.6084/m9.figshare.20483793).
+    Recording available at <https://www.youtube.com/watch?v=nCktihu9bWg>
 
-    ![](_static/scipy2022-youtube-thumbnail.jpg){.align-center width="80%"}
+    [![](_static/scipy2022-youtube-thumbnail.jpg){.align-center width="80%"}](https://www.youtube.com/watch?v=nCktihu9bWg)
 
 -   "PyGMT: Accessing the Generic Mapping Tools from Python".
     2019.
@@ -60,9 +61,10 @@ These are conference presentations about the development of PyGMT (previously "G
     2018.
     Leonardo Uieda and Paul Wessel.
     Presented at *SciPy 2018*.
-    doi:[10.6084/m9.figshare.6814052](https://doi.org/10.6084/m9.figshare.6814052)
+    doi:[10.6084/m9.figshare.6814052](https://doi.org/10.6084/m9.figshare.6814052).
+    Recording available at <https://www.youtube.com/watch?v=6wMtfZXfTRM>
 
-    ![](_static/scipy2018-youtube-thumbnail.png){.align-center width="80%"}
+    [![](_static/scipy2018-youtube-thumbnail.png){.align-center width="80%"}](https://www.youtube.com/watch?v=6wMtfZXfTRM)
 
 -   "Integrating the Generic Mapping Tools with the Scientific Python Ecosystem".
     2018.
@@ -76,9 +78,10 @@ These are conference presentations about the development of PyGMT (previously "G
     2017.
     Leonardo Uieda and Paul Wessel.
     Presented at *SciPy 2017*.
-    doi:[10.6084/m9.figshare.7635833](https://doi.org/10.6084/m9.figshare.7635833)
+    doi:[10.6084/m9.figshare.7635833](https://doi.org/10.6084/m9.figshare.7635833).
+    Recording available at <https://www.youtube.com/watch?v=93M4How7R24>
 
-    ![](_static/scipy2017-youtube-thumbnail.png){.align-center width="80%"}
+    [![](_static/scipy2017-youtube-thumbnail.png){.align-center width="80%"}](https://www.youtube.com/watch?v=93M4How7R24)
 
 -   "A modern Python interface for the Generic Mapping Tools".
     2017.