DOC-7528: Convert public channels to private channels page needs animated GIFs for mobile app workflows

[Rutam21]

Summary

This PR adds visual workflows for the Mattermost mobile app tab on the Convert public channels to private channels page

Ticket Link

Fixes #7528

• This PR follows Mattermost Contributing Guidelines.

[mattermost-build]

Hello @Rutam21,

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[Rutam21]

@cwarnermm Please review and suggest changes, if any. Thanks.

@lindy65 Please add this to my queue for QA Testing once the reviews are complete. Thank you.

[lindy65]

Assigned to you for testing @Rutam21 - will still count towards Hacktoberfest as it was done before end of day 31 October

[github-actions]

Newest code from Rutam21 has been published to preview environment for Git SHA 26a1fb6

[Rutam21]

The changes are tested in the preview environment and they reflect properly.

• The Convert public channels to private channels page has now 5 workflow images for visual learners under the mobile section tab.

Please refer to the screenshots below as a confirmation.

Current Docs Page [Convert public channels to private channels]

Preview Environment Page

Step 1

Step 2

Step 3

Step 4

Step 5

[ Awaiting final review from @cwarnermm ]

cc: @lindy65

[lindy65]

Thanks for testing @Rutam21 - counted towards Hacktoberfest

[cwarnermm]

Thank you, @Rutam21!