Add Vim syntax highlighting and CoC LS links

[b-j-roberts]

Custom Vim setup links for Cairo1 syntax highlighting and coc.nvim language server.

Checklist

• The URL is not already present in the list (check with CTRL/CMD+F in the
  raw markdown file).
• Each description starts with an uppercase character and ends with a
  period.
  Example: cairo - The Cairo programming language.
• Drop all A / An prefixes at the start of the description.
• Avoid using the word Starknet in the description.

[mursaleenyt]

Vim setup abides checklist item