[ImgBot] Optimize images

*Total -- 1,779.33kb -> 1,546.13kb (13.11%)

/static/images/rehnert.co-twitter-card.png -- 846.90kb -> 714.75kb (15.6%)
/static/images/rehnert.co-OGimg.png -- 551.96kb -> 471.42kb (14.59%)
/static/images/rehnert.co-OGimg.svg -- 183.51kb -> 173.23kb (5.6%)
/static/images/rehnert.co-twitter-card.svg -- 196.97kb -> 186.73kb (5.19%)

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