Fix: uwu logo style & alt text from Home.vue

[yamanoku]

Description of Problem

• Insert alternative text for the logo itself (because this is a meaningful logo image, not a background image)
• To prevent layout shift for the image, specify the width and height
• The :global specification is meaningless since CSS Modules are not being used

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[yyx990803]

FYI the original implementation was intentional because we don't want to load the image when the users didn't explicitly have ?uwu in the URL...