[ImgBot] Optimize images

*Total -- 1,425.84kb -> 1,146.04kb (19.62%)

/plugins/kubectx/prod.png -- 3.74kb -> 2.29kb (38.71%)
/plugins/kubectx/stage.png -- 3.74kb -> 2.35kb (37.16%)
/plugins/zsh-navigation-tools/doc/img/n-history2.png -- 105.78kb -> 70.81kb (33.05%)
/plugins/localstack/sqs-send-result.png -- 69.00kb -> 55.75kb (19.21%)
/plugins/z/img/demo.gif -- 1,241.72kb -> 1,012.99kb (18.42%)
/plugins/z/img/zsh_4.3.11_plus.svg -- 0.93kb -> 0.93kb (0.11%)
/plugins/z/img/mit_license.svg -- 0.93kb -> 0.93kb (0.11%)

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

plugins/z/img/mit_license.svg

@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="78" height="20"><linearGradient id="b" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="a"><rect width="78" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#a)"><path fill="#555" d="M0 0h47v20H0z"/><path fill="#97CA00" d="M47 0h31v20H47z"/><path fill="url(#b)" d="M0 0h78v20H0z"/></g><g fill="#fff" text-anchor="middle" font-family="DejaVu Sans,Verdana,Geneva,sans-serif" font-size="110"><text x="245" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="370">license</text><text x="245" y="140" transform="scale(.1)" textLength="370">license</text><text x="615" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="210">MIT</text><text x="615" y="140" transform="scale(.1)" textLength="210">MIT</text></g> </svg>
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plugins/z/img/zsh_4.3.11_plus.svg

@@ -1 +1 @@
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+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="84" height="20"><linearGradient id="b" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="a"><rect width="84" height="20" fill="#fff" rx="3"/></clipPath><g clip-path="url(#a)"><path fill="#555" d="M0 0h29v20H0z"/><path fill="#e05d44" d="M29 0h55v20H29z"/><path fill="url(#b)" d="M0 0h84v20H0z"/></g><g fill="#fff" font-family="DejaVu Sans,Verdana,Geneva,sans-serif" font-size="110" text-anchor="middle"><text x="155" y="150" fill="#010101" fill-opacity=".3" textLength="190" transform="scale(.1)">zsh</text><text x="155" y="140" textLength="190" transform="scale(.1)">zsh</text><text x="555" y="150" fill="#010101" fill-opacity=".3" textLength="450" transform="scale(.1)">4.3.11+</text><text x="555" y="140" textLength="450" transform="scale(.1)">4.3.11+</text></g></svg>