feat(prettier, prettierd): added svelte and astro filetypes

[AlejandroSuero]

I was using the filetypes svelte and astro with formatting.prettierd.with({ extra_filetypes = { "astro", "svelte" }}) and it works fine.

I think we should add those in the filetypes entry.

Note

Eslint lsp now is updated to work with these filetypes

[AlejandroSuero]

I assumed that the docs are generated automatically, but I can commit them if needed.

Already ran make autogen and it generated the docs in my end.