fix: update reference to agent.dev in examples and docs (#3198)

* fix: update agent ID in example templates
* fix: update agent ID in dogfood template
* chore: update default agent ID in documentation
* fix: develop.sh: start FE after template is created; leave template dir around if template creation fails

docs/ides/configuring-web-ides.md

@@ -17,7 +17,7 @@ be used as a Coder application. For example:
 ```hcl
 # Give template users the portainer.io web UI
 resource "coder_app" "portainer" {
-  agent_id      = coder_agent.dev.id
+  agent_id      = coder_agent.main.id
   name          = "portainer"
   icon          = "https://simpleicons.org/icons/portainer.svg"
   url           = "http://localhost:8000"
@@ -69,7 +69,7 @@ You'll also need to specify a `coder_app` resource related to the agent. This is
 
 ```hcl
 resource "coder_app" "code-server" {
-  agent_id = coder_agent.dev.id
+  agent_id = coder_agent.main.id
   name     = "code-server"
   url      = "http://localhost:13337/?folder=/home/coder"
   icon     = "/icon/code.svg"