fix(async): 非同期処理と同期処理の図を追加(並列)

[azu]

fix #1459

[bot-user]

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Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 34.2%, saving 1.78 MB.

Filename	Before	After	Improvement	Visual comparison
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source/basic/async/img/async-single-thread-tasks.png	783.21 KB	565.41 KB	-27.8%	View diff
source/basic/async/img/block--async-single-thread-tasks.png	1.18 MB	866.29 KB	-28.0%	View diff
source/basic/async/img/promise-chain.png	19.60 KB	13.69 KB	-30.2%	View diff
source/basic/async/img/single-thread-tasks.png	827.13 KB	583.22 KB	-29.5%	View diff
source/basic/async/img/then-rejected-promise.png	35.14 KB	25.55 KB	-27.3%	View diff
source/basic/error-try-catch/img/console.error.png	128.60 KB	69.74 KB	-45.8%	View diff
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source/use-case/ajaxapp/promise/img/fig-1.png	100.50 KB	54.23 KB	-46.0%	View diff
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source/use-case/todoapp/app-structure/img/todo-html.png	104.09 KB	44.61 KB	-57.1%	View diff
source/use-case/todoapp/entrypoint/img/first-entry.png	118.62 KB	59.62 KB	-49.7%	View diff
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source/use-case/todoapp/form-event/img/prevent-event.png	138.69 KB	67.15 KB	-51.6%	View diff
source/use-case/todoapp/update-delete/img/input-checkbox.png	8.92 KB	8.33 KB	-6.5%	View diff

3 images did not require optimisation.

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 28%, saving 337.01 KB.

Filename	Before	After	Improvement	Visual comparison
source/basic/async/img/block--async-single-thread-tasks.png	1.18 MB	867.33 KB	-28.0%	View diff

42 images did not require optimisation.