[CDTOOL-1299] Improve Issue Template Routing (#1705)

### Change summary

This PR adds support docs and notes to existing templates clarifying
when to reach out to support and general best practices around issue
submitting.

 All Submissions:

* [x] Have you followed the guidelines in our Contributing document?
* [x] Have you checked to ensure there aren't other open [Pull
Requests](https://github.com/fastly/cli/pulls) for the same
update/change?

<!-- You can erase any parts of this template not applicable to your
Pull Request. -->


### User Impact

Users no longer have access to the "Blank Issue" option.

Author: rcaril

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,6 +7,17 @@ assignees: ''
 
 ---
 
+<!-- 
+  **Note**:  Please keep in mind that if your issue requires troubleshooting that will require any details that you aren't comfortable disclosing in this public forum (such as service IDs), you will need to open a Fastly support ticket instead: https://support.fastly.com. 
+  
+  Bug reports opened here:
+    - Do not have an SLA
+    - Should not be a duplicate of an existing support ticket that you have already created, or vice versa
+    - May take longer to solve compared to our dedicated support team
+
+  More details on submitting issues can be found here: https://github.com/fastly/cli/blob/main/ISSUES.md 
+-->
+
 **Version**
 
 Please paste the output of `fastly version` here.

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,2 @@
+# Disable blank issues for non-maintainers. 
+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.md

@@ -7,6 +7,16 @@ assignees: ''
 
 ---
 
+<!-- 
+  **Note**:  Please keep in mind that if your feature request discusses any details that you aren't comfortable disclosing in this public forum (such as service IDs), you will need to open a Fastly support ticket instead: https://support.fastly.com. 
+  
+  Feature requests opened here:
+    - Do not have an SLA nor are guaranteed to be implemented
+    - Should not be a duplicate of an existing support ticket that you have already created, or vice versa
+
+  More details on submitting issues can be found here: https://github.com/fastly/cli/blob/main/ISSUES.md 
+-->
+
 **Is your feature request related to a problem? Please describe.**
 A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
 

ISSUES.md

@@ -0,0 +1,34 @@
+<div align="center">
+  <h3 align="center">CLI Issues</h3>
+  <p align="center">Best practices for submitting an issue to the Fastly CLI repository.</p>
+</div>
+
+## Issue Type: Bug
+
+Issues related to the CLI behavior not working as intended. 
+
+- The CLI crashes or exits with an unexpected error
+- A command produces incorrect output or wrong results
+- Commands or flags don't work as documented
+
+**Example:** "When I run `fastly service list --json`, malformed JSON is produced."
+
+## Issue Type: Feature Request
+
+Issues related to suggesting improvements to the CLI:
+
+- New commands or subcommands based on existing Fastly APIs
+- Improved error messages or user experience
+- Adding support for a third party integration
+
+**Example:** "Add a `fastly service version validate` command, which already exists in the Fastly API."
+
+## Fastly Support
+
+CLI behavior specific to your environment or service / account should be routed to the Fastly support team @ support.fastly.com or support@fastly.com. 
+
+- A feature is missing from your account / service
+- Partial content is returned that you may not have access to with your current Fastly account role
+- My site is not loading after a configuration change
+
+**Example:** When running `fastly service vcl snippet create`, an error is thrown that the provided VCL is not valid

README.md

@@ -18,8 +18,10 @@
 - [Commands](https://www.fastly.com/documentation/reference/cli#command-groups)
 - [Development](https://github.com/fastly/cli/blob/main/DEVELOPMENT.md)
 - [Testing](https://github.com/fastly/cli/blob/main/TESTING.md)
+- [Issues](https://github.com/fastly/cli/blob/main/ISSUES.md)
 - [Documentation](https://github.com/fastly/cli/blob/main/DOCUMENTATION.md)
 
+
 ## Environment Variables
 
 | Variable | Description |