feature: Add support for epwalsh/obsidian.nvim

[anupam-basu]

Describe the solution you'd like

In the Dawn theme reading bullet points, checkboxes and links/reference texts are but too light on my eyes. Here are some screenshots

Hoping for some more stark highlights than the current one.

Additional context

I've been using epwalsh/obsidian.nvim
and modified the setup to have more agreeable colors to my eyes, but I was hoping the default can be changed or updated.

    require("obsidian").setup({
      ui = {
        hl_groups = {
          ObsidianBullet = { fg = "#b4637a" },
          ObsidianRefText = { underline = true, fg = "#286983" },
        },
      },...

These colors I thought were better, if there are any other suggestions for them, more than happy to accept !

[mvllow]

Ah those aren't Rosé Pine colours so we need to add support for that plugin. If you want to submit a PR with your preferred changes (ideally we would theme all colours for that plugin) that would be appreciated :) For simplicity we could match the checkbox unchecked to our gold, checked to our foam and their purple in the "Done List" example to be our iris.

A good way to test this locally would be:

require("rose-pine").setup({
  -- Accepts highlight names from rosepinetheme.com/palette
  highlight_groups = {
    ObsidianBullet = { fg = "muted" },
    ObsidianRefText = { fg = "iris", underline = true },
  }
})