[ImgBot] Optimize images

*Total -- 3,577.45kb -> 3,172.69kb (11.31%)

/mails/pre_release_week_1/strategies.png -- 64.84kb -> 40.11kb (38.14%)
/mails/pre_release_week_1/rewards.png -- 116.21kb -> 85.00kb (26.86%)
/mails/pre_release_week_1/learn.png -- 192.95kb -> 141.48kb (26.67%)
/mails/pre_release_week_1/app-dashboard.png -- 43.09kb -> 32.13kb (25.43%)
/mails/pre_release_week_1/app-explorer.png -- 181.17kb -> 136.83kb (24.47%)
/mails/product_hunt/octobot-2.0.0-preview-dark.png -- 109.57kb -> 88.82kb (18.94%)
/mails/product_hunt/octobot-2.0.0-preview.png -- 107.90kb -> 87.66kb (18.75%)
/mails/app_update/stop_bot.png -- 167.90kb -> 143.27kb (14.67%)
/mails/pre_release_week_1/news.png -- 436.57kb -> 385.62kb (11.67%)
/mails/app_update/investment.jpg -- 294.89kb -> 275.04kb (6.73%)
/mails/app_update/create-account.jpg -- 253.34kb -> 237.48kb (6.26%)
/mails/app_update/news-for-you.jpg -- 680.93kb -> 640.17kb (5.99%)
/mails/app_update/news-topics.jpg -- 243.50kb -> 229.24kb (5.86%)
/mails/app_update/strategies.jpg -- 494.98kb -> 469.49kb (5.15%)
/mails/app_update/portfolio.png -- 189.59kb -> 180.35kb (4.88%)

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