Docs restyling

[GabrielaReyna]

Changes

• Svelte has been updated for astro-theme (had to do this to run my local dev build, and just makes sense to have everything in the same Svelte version as the rest of the sites)
• Colour scheme in pink is the default, but it changes to emerald/teal if browserpod is the current site
• The colour scheme is not hardcoded anymore and is now set as CSS variables and RGB
• The same for the background colours
• Wider reading area in DocsArticle without sqooshing the side bars
• Edits on left side bar
• Edits on TOC, it now highlights while scrolling
• Removed Global NavBar
• Added custom colour schemes for the rest of the sites

To test:

• Check if these colour changes look odd, for all the sites
• Please notice the default colour scheme might have some changes on the rest of the sites
• please browse around the sites and let me know of anything odd

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