Add vscode-themes under automation and archive it

[Kobzol]

Repo: https://github.com/rust-analyzer/vscode-themes

Decided to archive it, as per #t-compiler/rust-analyzer > Rust-analyzer org repository access and status.

Original content

org = "rust-analyzer"
name = "VsCode-themes"
description = "VsCode themes for rust-analyzer"
bots = []

[access.teams]

[access.individuals]
MissHolmes = "admin"
matklad = "admin"
Xanewok = "admin"
flodiebold = "admin"
davidbarsky = "admin"
wesleywiser = "admin"
lnicola = "admin"
Veykril = "admin"
pnkfelix = "admin"
rust-lang-owner = "admin"
pietroalbini = "admin"
skade = "admin"

[github-actions]

Dry-run check results

[WARN  sync_team] sync-team is running in dry mode, no changes will be applied.
[INFO  sync_team] synchronizing github
[INFO  sync_team] 💻 Repo Diffs:
    📝 Editing repo 'rust-analyzer/VsCode-themes':
      Archive
      Enable auto-merge
      Permission Changes:
        Removing user 'matklad''s admin permission 
        Removing user 'davidbarsky''s admin permission