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

[cloudflare-workers-and-pages]

Deploying labs-browserpod-previews with    Cloudflare Pages

Latest commit:	d78799f
Status:	✅  Deploy successful!
Preview URL:	https://a1e7a7ed.labs-browserpod-previews.pages.dev
Branch Preview URL:	https://docs-restyling.labs-browserpod-previews.pages.dev

View logs

[codingfrog27]

Looking good! I think this is a substantial improvement for user reading experience, great job 🔥

Testing

• I've browsed all preview sites, comparing them with with their live counterpart.
• Search bar is functional on all sites
• random links clicked and work as expected

Colours look good! I like the added "on this page" text as well.

And argument could be made that CheerpX's highlight colour should be more grey/dim. But I think it's good this way for the sake of contrast.

general notes/issues

I did notice a few things. They are not caused by this PR but seem worth noting in general. I've also added them as subtasks to my "further labs improvement" Asana task

• the TOC only start counting from the first heading and dont include the title. This makes the first paragraph non present or clickable
• When an item is clicked in the TOC it will scroll to the first line below the heading, I think it being on the heading would be slightly better
• in CheerpJ. Selecting Japanese from the drop down menu will link to a non existent page.