DOC-7500: Invite People page needs animated GIFs for mobile app workflows

[Rutam21]

Summary

This PR adds visual workflows for the Mattermost mobile app tabs on the Invite People page

Ticket Link

Fixes #7500

• [x] This PR follows Mattermost Contributing Guidelines.

[mattermost-build]

Hello @Rutam21,

Thanks for your pull request! A Core Committer will review your pull request soon. For code contributions, you can learn more about the review process here.

[Rutam21]

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

[github-actions[bot]]

Newest code from Rutam21 has been published to preview environment for Git SHA 2e5a5d8d7a1b68b0d314eb78143eca7a0e815dc5

[Rutam21]

@cwarnermm All the requested changes have been done. Please review. Thanks.

[github-actions[bot]]

Newest code from Rutam21 has been published to preview environment for Git SHA 3a76d2fe4102714312ed3b9d4b7197f30b7fb4e0

[github-actions[bot]]

Newest code from Rutam21 has been published to preview environment for Git SHA 8c167a13e34c50f89dcc81a808d805e77471e705

[github-actions[bot]]

Newest code from Rutam21 has been published to preview environment for Git SHA 74c0346b8d6303d9c997c95c5d935f0edf1e561e

[varghesejose2020]

@lindy65 please assign me

[lindy65]

Assigned to you for testing @varghesejose2020 - you can check the preview environment here

[varghesejose2020]

The changes in this PR have been tested in the preview environment and changes are working as expected. Adding screenshots for confirmation

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cc: @lindy65

[lindy65]

Thanks for testing @varghesejose2020 - counted towards Hacktoberfest

cc @cwarnermm