fix: update connector links and streamline icon components

- Changed Linkup API link from linkup.ai to linkup.so in the connector popup.
- Removed unused IconSparkles and replaced it with Luma SVG in the connector icons.
- Updated image properties for Linear, GitHub, Google Calendar, Google Gmail, and Google Drive connectors to ensure consistent sizing.
- Replaced old SVG files for GitHub, Google Calendar, Google Drive, Google Gmail, and Linear with new versions for improved visuals.

surfsense_web/public/connectors/github.svg

@@ -1 +1 @@
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