[Members] rename tag to chairs, remove unneccessary entries

Author: jpthiele

content/members/drittelhacker/index.md

@@ -1,10 +1,8 @@
 ---
 title: "Jens Saak"
-tags: ["Speaker","GAMM member","MaRDI"]
+tags: ["Chair","GAMM member","MaRDI"]
 externalUrl: "https://www.mpi-magdeburg.mpg.de/person/26697/2311"
 showTaxonomies: true
+weight: 0
 showDate: false
-showAuthor: false
-showReadingTime: false
-layoutBackgroundHeaderSpace: false
 ---

content/members/jpthiele/index.md

@@ -1,10 +1,7 @@
 ---
 title: "Jan Philipp Thiele"
-tags: ["Speaker","GAMM member","de-RSE member"]
+tags: ["Chair","GAMM member","de-RSE member"]
 externalUrl: "https://github.com/jpthiele"
 showTaxonomies: true
 showDate: false
-showAuthor: false
-showReadingTime: false
-layoutBackgroundHeaderSpace: false
 ---

content/members/rspeck/index.md

@@ -1,10 +1,8 @@
 ---
 title: "Robert Speck"
-tags: ["Speaker","GAMM member","de-RSE member"]
+tags: ["Chair","GAMM member","de-RSE member"]
 externalUrl: "https://www.fz-juelich.de/profile/speck_r"
 showTaxonomies: true
 showDate: false
 showAuthor: false
-showReadingTime: false
-layoutBackgroundHeaderSpace: false
 ---