Shrink the text in us.md

I removed User group section since the content is in the community page. I also removed the Credits section. We need to agree on what to do with this later. It is too long. Maybe it can be moved to the wiki.

content/about/us.md

@@ -1,16 +1,9 @@
 ---
-title: "Developers"
+title: "About us"
 date: 2018-12-29T11:02:05+06:00
 layout: "overview"
 ---
 
-The GRASS GIS project is an international team effort including [scientists and developers](https://grasswiki.osgeo.org/wiki/Team) from various fields. GRASS - Geographic Resources Analysis Support System - has been under continuous development since 1982 and has involved a large number of federal US agencies, universities, and private companies. The core components of GRASS and the management of the integration of the efforts into GRASS releases were accomplished by the Construction Engineering Resesarch Laboratory (CERL) in Champaign, Illinois. It has been estimated that several million dollars of GRASS GIS software development efforts across the government have been completed since the 4.1 release. Since 1997 a worldwide network of developers continue to release new GRASS GIS versions (see GRASS history).
+The GRASS GIS project is an international team effort that includes [scientists and developers](https://grasswiki.osgeo.org/wiki/Team) from various fields. GRASS - Geographic Resources Analysis Support System - has been under continuous development since 1982 and it has involved a large number of federal US agencies, universities, and private companies. The core components of GRASS GIS and the management of releases were developed and handled by the Construction Engineering Resesarch Laboratory (CERL) in Champaign, Illinois. Since 1997 a worldwide network of developers continue to release new GRASS GIS versions (see GRASS history section).
 
-The strength and success of GRASS GIS relies on the user community. The philosophy of the GRASS Development Team is to encourage users to develop their own unique tools and applications for GRASS as well as to improve the existent ones.
-
-## User Groups
-
-There are many GRASS users around the world. See the [local chapters](https://www.osgeo.org/local-chapters/) website for more details.
-## Credits
-
-TODO
+The strength and success of GRASS GIS relies on the user community. The philosophy of the GRASS GIS Development Team is to encourage users to develop their own unique tools and applications as well as to improve the existent ones.