[ImgBot] Optimize images

*Total -- 11,641.76kb -> 11,106.82kb (4.59%)

/static/img/blog-footer-01.jpg -- 6.63kb -> 5.67kb (14.48%)
/static/img/tutorials/html/how-html-works.png -- 429.45kb -> 368.87kb (14.1%)
/static/img/blog-footer-02.jpg -- 6.14kb -> 5.30kb (13.54%)
/static/img/tutorials/technical-writer/style-and-tone-cover.png -- 280.87kb -> 247.16kb (12%)
/static/img/tutorials/technical-writer/best-practices.png -- 307.92kb -> 272.72kb (11.43%)
/static/img/tutorials/technical-writer/tools-for-technical-writers.png -- 337.61kb -> 301.41kb (10.72%)
/static/img/tutorials/technical-writer/audience-cover.png -- 294.80kb -> 264.90kb (10.14%)
/static/img/tutorials/technical-writer/types-of-technical-writing-cover.png -- 395.85kb -> 355.73kb (10.13%)
/static/img/tutorials/technical-writer/skills-required-cover.png -- 296.31kb -> 267.97kb (9.57%)
/static/img/tutorials/technical-writer/technical-writer-cover.png -- 1,278.56kb -> 1,208.32kb (5.49%)
/static/img/tutorials/technical-writer/review-editing-cover.png -- 2,909.98kb -> 2,807.08kb (3.54%)
/static/img/tutorials/technical-writer/structure-and-formatting-cover.png -- 2,740.65kb -> 2,646.80kb (3.42%)
/static/img/tutorials/technical-writer/visual-aids-cover.png -- 2,357.01kb -> 2,354.88kb (0.09%)

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