Add text for teams (#629)

Author: goanpeca

.gitignore

@@ -6,3 +6,5 @@ resources/
 
 .vscode/
 .idea/*
+
+.DS_Store

content/en/teams/index.md

@@ -5,16 +5,24 @@ sidebar: false
 
 ### Maintainers
 
+Contributors with merge rights on GitHub.
+
 {{< grid file="maintainers.toml" columns="2 3 4 5" />}}
 
 ### Triage team
 
+Contributors with triage rights on GitHub.
+
 {{< grid file="triage-team.toml" columns="2 3 4 5" />}}
 
 ### Web team
 
+People who have contributed to the development of the SciPy.org website.
+
 {{< grid file="web-team.toml" columns="2 3 4 5" />}}
 
 ### Emeritus maintainers
 
+Maintainers who have contributed to SciPy in the past.
+
 {{< grid file="emeritus-maintainers.toml" columns="2 3 4 5" />}}