Update composer.json and sets extension version to stable

.gitignore

 bin
 vendor
 typo3_src
-composer.lock
 html/index.php
 html/typo3
 html/fileadmin/

composer.json

 {
   "name": "t3o/typo3.org",
   "description": "Website for TYPO3.org",
-  "minimum-stability": "dev",
-  "prefer-stable": true,
   "authors": [
     {
       "name": "t3o team",
@@ -39,15 +37,15 @@
     "typo3/cms": "^8.7",
     "helhum/typo3-console": "4.9.2",
     "dmitryd/typo3-realurl": "2.3.0",
-    "t3o/t3olayout": "dev-develop",
+    "t3o/t3olayout": "^2.1",
     "t3o/certifications": "^1.0",
     "georgringer/news": "6.1.1",
     "apache-solr-for-typo3/solr": "7.5.0",
-    "reelworx/rx-shariff": "10.2.1  ",
+    "reelworx/rx-shariff": "10.2.1",
     "derhansen/sf_event_mgt": "^2.1",
     "t3o/typo3_roadmap": "^1.0",
     "t3o/t3o_membership": "^1.3",
-    "t3o/randombanners": "dev-master",
+    "t3o/randombanners": "^1.0",
     "clickstorm/cs_seo": "2.2.0"
   },
   "config": {
@@ -65,7 +63,6 @@
   },
   "autoload": {
     "psr-4": {
-      "T3o\\T3olayout\\": "html/typo3conf/ext/t3olayout/Classes",
       "T3o\\T3orgLayout\\": "html/typo3conf/ext/t3org_layout/Classes"
     }
   }