Added WakaTime svg with light and dark mode variants

[DexAsHisH]

Closes #791

📝 About your SVG:

• Title: WakaTime
• Category: Devtool
• Website URL: https://wakatime.com
• Description: WakaTime is an open-source plugin for metrics, insights, and time tracking automatically generated from your programming activity.

📷 Screenshots:

✅ Checklist

• I have permission to use this logo (official WakaTime brand assets)
• The .svg files are optimized for web use (optimized with SVGOMG)
• The .svg sizes are less than 20kb
• Both light and dark mode variants included
• viewBox preserved and verified

📋 Additional Information:

• Source: Official WakaTime Logos and Trademark Usage page
• License: Allowed per their usage guidelines.
• Brand Guidelines: https://wakatime.com/legal/logos-and-trademark-usage

[pheralb]

Thanks 🚀 ✨