[ImgBot] Optimize images

*Total -- 6,271.87kb -> 4,864.63kb (22.44%)

/assets/img/helpdesk-logo.png -- 66.97kb -> 34.66kb (48.24%)
/assets/img/giphy-for-livechat-installed.png -- 68.56kb -> 46.10kb (32.76%)
/assets/img/giphy-for-livechat-uninstalled.png -- 67.45kb -> 45.63kb (32.35%)
/assets/img/giphy-for-livechat-message-box.png -- 15.75kb -> 10.68kb (32.17%)
/assets/img/google-for-helpdesk-signin.png -- 249.14kb -> 182.62kb (26.7%)
/assets/img/slack-for-helpdesk-calendar-slack-button.png -- 248.99kb -> 183.37kb (26.35%)
/assets/img/slack-for-helpdesk-settings.png -- 249.40kb -> 184.86kb (25.88%)
/assets/img/loom-for-livechat-init.png -- 264.39kb -> 199.59kb (24.51%)
/assets/img/google-for-helpdesk-successful.png -- 300.61kb -> 231.78kb (22.9%)
/assets/img/slack-for-helpdesk-settings-button.png -- 306.63kb -> 236.54kb (22.86%)
/assets/img/google-for-helpdesk-calendar.png -- 305.27kb -> 235.54kb (22.84%)
/assets/img/google-for-helpdesk-calendar-select.png -- 304.70kb -> 235.13kb (22.83%)
/assets/img/google-for-helpdesk-details.png -- 297.02kb -> 229.79kb (22.63%)
/assets/img/google-for-helpdesk-section-update.png -- 314.11kb -> 244.46kb (22.17%)
/assets/img/loom-for-livechat-finishing.png -- 285.60kb -> 222.44kb (22.12%)
/assets/img/google-for-helpdesk-init.png -- 318.87kb -> 249.74kb (21.68%)
/assets/img/slack-for-helpdesk-add-to-channel.png -- 344.86kb -> 270.15kb (21.66%)
/assets/img/loom-for-livechat-inserting.png -- 309.69kb -> 243.72kb (21.3%)
/assets/img/slack-for-helpdesk-section-in-helpdesk-ticket.png -- 320.14kb -> 253.69kb (20.76%)
/assets/img/slack-for-helpdesk-in-slack.png -- 424.33kb -> 339.14kb (20.08%)
/assets/img/helpdesk-app-settings.png -- 346.33kb -> 276.98kb (20.03%)
/assets/img/loom-for-livechat-configuring.png -- 310.37kb -> 248.23kb (20.02%)
/assets/img/slack-livechat-install-success.png -- 151.17kb -> 125.28kb (17.13%)
/assets/img/loom-for-livechat-details-box.png -- 401.53kb -> 334.53kb (16.69%)

Signed-off-by: ImgBotApp <ImgBotHelp@gmail.com>

Author: ImgBotApp