Webex v0.1: use correct icons for join and channel header, final touches

Description

As in the summary.

QA Test Steps

None

Status

Mana

0

Assignee

Christopher Poile

QA Assignee

Dylan Haussermann

Reporter

Christopher Poile

Epic Link

Fix versions

Mattermost Team

Integrations

Sprint

None

Labels

None

QA Testing Areas

None

GitHub Issue

None

Components

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