change gitter connect button to match jenkins.io (#349)

* change gitter connect button to match jenkins.io

* Update index.adoc

* Update index.adoc

* Update index.adoc

* Update index.adoc

just doing to redeploy

Author: biru-codeastromer

docs/sigs/modules/advocacy-and-outreach/pages/index.adoc

@@ -3,7 +3,7 @@
 .Connect
 ****
 * https://groups.google.com/g/jenkins-advocacy-and-outreach-sig[Mailing List]
-* https://app.gitter.im/#/room/#jenkinsci_advocacy-and-outreach-sig:gitter.im[Gitter]
+* https://gitter.im/jenkinsci/advocacy-and-outreach-sig[image:https://img.shields.io/badge/gitter%20-%20join%20chat%20-%20Green[Gitter Chat]]
 * https://docs.google.com/document/d/1K5dTSqe56chFhDSGNfg_MCy-LmseUs_S3ys_tg60sTs/edit#heading=h.9jh09t587y90[Meetings]
 * https://community.jenkins.io/c/contributing/advocacy-and-outreach[Forum]
 ****

docs/sigs/modules/docs/pages/index.adoc

@@ -2,7 +2,7 @@
 
 .Connect
 ****
-* https://app.gitter.im/#/room/#jenkins/docs:matrix.org[Gitter]
+* https://gitter.im/jenkins/docs[image:https://img.shields.io/badge/gitter%20-%20join%20chat%20-%20Green[Gitter Chat]]
 * https://docs.google.com/document/d/1ygRZnVtoIvuEKpwNeF_oVRVCV5NKcZD1_HMtWlUZguo/edit[Meetings]
 ****
 

docs/sigs/modules/gsoc/pages/index.adoc

@@ -2,7 +2,7 @@
 
 .Connect
 ****
-* https://app.gitter.im/#/room/#jenkinsci_gsoc-sig:gitter.im[Gitter]
+* https://gitter.im/jenkinsci/gsoc-sig[image:https://img.shields.io/badge/gitter%20-%20join%20chat%20-%20Green[Gitter Chat]]
 * https://community.jenkins.io/c/contributing/gsoc[Forum]
 ****
 

docs/sigs/modules/platform/pages/index.adoc

@@ -2,7 +2,7 @@
 
 .Connect
 ****
-* https://app.gitter.im/#/room/#jenkinsci_platform-sig:gitter.im[Gitter]
+* https://gitter.im/jenkinsci/platform-sig[image:https://img.shields.io/badge/gitter%20-%20join%20chat%20-%20Green[Gitter Chat]]
 * https://www.jenkins.io/sigs/platform/#meetings[Meetings]
 ****
 

docs/sigs/modules/ux/pages/index.adoc

@@ -2,7 +2,7 @@
 
 .Connect
 ****
-* https://app.gitter.im/#/room/#jenkinsci/ux-sig:matrix.org[Gitter]
+* https://gitter.im/jenkinsci/ux-sig[image:https://img.shields.io/badge/gitter%20-%20join%20chat%20-%20Green[Gitter Chat]]
 * https://docs.google.com/document/d/1QttPwdimNP_120JukigKsRuBvMr34KZhVfsbgq1HFLM/edit?usp=sharing[Meetings]
 * https://community.jenkins.io/c/contributing/ux-sig[Forum]
 ****