Webex v0.1: get correct icons in channel header and join links

Description

Svgs in the webex plugin are using the ones we use in zoom (for channel header and join button). What icons should we be using? Get those in svg format and send them to .

QA Test Steps

See description

Status

Mana

None

Assignee

Aaron Rothschild

QA Assignee

Dylan Haussermann

Reporter

Christopher Poile

Epic Link

Fix versions

Mattermost Team

Integrations

Sprint

None

Labels

None

QA Testing Areas

Plugins

GitHub Issue

None

Components

None
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