Update Help Text for sysadmin vs non-sysadmin.

[jfrerich]

This request is to implement the following changes:

1 Allow non-sysadmin users to run the following commands:

• /confluence list

This is the only command that will be allowed for non-sysadmin users

2 Update help text message

The current message can be seen below but is incorrect. Give the change mentioned above, please modify the help text to move the following below the For System Administrators Section and above the Setup Instructions

• /confluence subscribe
• /confluence unsubscribe
• /confluence edit

3 update autocomplete commands to show commands based on user permissions (admin, non-admin).

The following conversation was captured in the Plugin: Confluence Mattermost Channel

@ahmad.danial @aaron.rothschild and I discussed this in our team meeting this morning. We will investigate the option for allowing reduced restrictions for handling subscriptions, but for now, the user will need to contact the system admin to add or edit subscriptions.

What we will do for now is update the help text to show only the available commands for sysadmin versus non-sysadmin users.

We will also allow the non-sysadmins to run /confluence list

How does that sound?

Issue created from a Mattermost message by @jfrerich.