Rename variables from "team" to "server" in source code

[yuya-oc]

I confirm (by marking "x" in the [ ] below):

• This is not a troubleshooting question. Troubleshooting questions go here: http://www.mattermost.org/troubleshoot/.
• This doesn't reproduce on web browsers (such as in Chrome). If it does, issue reports go to the Mattermost Server repository.
• I have read contributing guidelines.

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Jira: https://mattermost.atlassian.net/browse/MM-14093

Summary
Rename variables from "team" to "server" in source code.
The name has been originally since there is no team side bar in webapp. In that time, the app need to handle "team" URL (https://SERVER/TEAM) to show multiple teams in the single window.
Now it's confusing so we need to rename for readability.

NOTE: There is a distinction between server and team, some of the code is actually talking about server when using team, however, the MM webapp actually has the concept of a team, so some uses of team in the code should stay as team. Please reach out if this is difficult to determine!

Possible fixes

• Rename variables by searching.
• Consider upgrading config.json schema version.

[thepill]

would like to do this as my first contribution and getting to know the project :)

[amyblais]

Jira ticket for tracking: https://mattermost.atlassian.net/browse/MM-14093.

[deanwhillier]

Updated the summary with an important note about server vs. team.

[alphaninja27]

Copy the entire code on a text editor and then search for keywords, and change accordingly, or send me the code I shall do it for you.

[HarikaGajjala221]

I would like to solve the issue

[devinbinnie]

@harika551 Are you still planning on working on this?