Update Appwrite's description and logo

[adityaoberai]

Please confirm this pull request meets the following requirements:

• I followed the contributing guidelines: https://github.com/github/explore/blob/main/CONTRIBUTING.md.
• This change is not self-promotion.

Which change are you proposing?

• Suggesting edits to an existing topic or collection
• Curating a new topic or collection
• Something that does not neatly fit into the binary options above

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Editing an existing topic or collection

I'm suggesting these edits to an existing topic or collection:

• Image (and my file is *.png, square, dimensions 288x288, size <= 75 kB)
• Content (and my changes are in index.md)

I currently work at Appwrite as the Developer Relations Lead. Over the last few years, Appwrite has evolved substantially as a product and added new features that extend its scope beyond the existing description. Also, we rebranded in 2023 and the logo currently present is no longer representitive of Appwrite.

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[Copilot]

Pull request overview

This PR updates Appwrite's topic information to reflect the product's evolution and 2023 rebrand. The changes update the description to emphasize Appwrite's expanded scope as a developer infrastructure platform and replace the outdated logo with the current branding.

Changes:

• Updated short and long descriptions to reflect Appwrite's current positioning as an open-source developer infrastructure platform
• Added "cloud" to related topics to reflect expanded feature set
• Replaced logo image (appwrite.png) with updated 2023 branding

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 2 comments.

File	Description
topics/appwrite/index.md	Updated descriptions to reflect Appwrite's evolution from a backend server to a full developer infrastructure platform; added "cloud" to related topics
topics/appwrite/appwrite.png	Replaced logo with 2023 rebranded version (binary file, stated to meet 288x288, ≤75KB requirements)

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[kenyonj]

Small typo in the short description — "an an" should be "an":

short_description: Appwrite is an open-source, developer infrastructure platform for building web, mobile, and AI apps.

[kenyonj]

Small typo to fix: "an an" in the short description should be "an". See my inline comment.

[kenyonj]

LGTM, thanks!