[GH-170] Allow to overwrite pre join page inside Mattermost

[raghavaggarwal2308]

Summary

Added radio buttons in system console settings to disable/enable the pre-join page in Jitsi meet when opened in minimized view.

1. Added field in plugin.json file to add "Show pre-join page" radio buttons.
2. OverWrite the Jitsi server config to disable/enable pre-join page.

   configOverwrite: {
   // Disable the pre-join page
   prejoinPageEnabled: this.props.meetingEmbedded && this.props.showPrejoinPage
   }

3. When the pre-join page is enabled in minimized view, vertical height of the window is increased to avoid croping of the user's profile image.
4. Fixed govet fieldalignment errors.

Screenshots

1. When pre-join page is disabled

2. When pre-join page is enabled

Ticket

Fixes #170

[raghavaggarwal2308]

@mickmister Gentle reminder for review

[raghavaggarwal2308]

@mickmister Gentle reminder for review

[raghavaggarwal2308]

@mickmister Gentle reminder for review

[raghavaggarwal2308]

@mickmister Gentle reminder for review

[raghavaggarwal2308]

@mickmister Gentle reminder for re-review

[raghavaggarwal2308]

@mickmister Gentle reminder for re-review

[mickmister]

@raghavaggarwal2308 It doesn't look like there have been any changes since I approved the PR. What would you like me to review?

[raghavaggarwal2308]

@mickmister I meant the review of the answers to the questions you asked when you last reviewed.

[mickmister]

@raghavaggarwal2308 I don't see answers to the questions either though

[raghavaggarwal2308]

@mickmister Sorry about that, you should be able to see them now

[mickmister]

Ok looks good. For future reference, mentioning me in the comments is good enough if you want to continue discussion on those individual threads. No need to ping with re-review requests if I have "approved" the PR. Hopefully that makes sense.

If the PR is only waiting on QA review, the person you want to reach out to is @DHaussermann

[mickmister]

@raghavaggarwal2308 Sorry if I seem aggressive in my previous comment. It's just a little frustrating to see this sit here like this. I'm sure it's more frustrating for you as well, sorry about this.

[raghavaggarwal2308]

@mickmister No issues, I understand :)

[DHaussermann]

/update-branch

[raghavaggarwal2308]

@DHaussermann Gentle reminder for review

[raghavaggarwal2308]

@DHaussermann Gentle reminder for review

[raghavaggarwal2308]

@DHaussermann Gentle reminder for review

[raghavaggarwal2308]

@DHaussermann Gentle reminder for review

[raghavaggarwal2308]

@DHaussermann Gentle reminder for review

[raghavaggarwal2308]

@DHaussermann Gentle reminder for review

[raghavaggarwal2308]

@DHaussermann Gentle reminder for review

[raghavaggarwal2308]

@DHaussermann Gentle reminder for review