Fix: revert docs/Project.toml to original deps

Tutorial uses plain julia code blocks (not @example), so
docs build environment does not need to install tutorial
dependencies. Extra packages were causing CI resolution
failures in the JuliaAstroDocs test suite.

Author: aditya-pandey-dev

docs/Project.toml

@@ -1,20 +1,7 @@
 [deps]
-Conda = "8f4d0f93-b110-5947-807f-2305c1781a2d"
-Cosmology = "76746363-e552-5dba-9a5a-cef6fa9cc5ab"
-DemoCards = "311a05b2-6137-4a5a-b473-18580a3d38b5"
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 DocumenterInterLinks = "d12716ef-a0f6-4df4-a9f1-a5a34e75c656"
-Downloads = "f43a241f-c20a-4ad4-852c-f6b1247861c6"
-DustExtinction = "fb44c06c-c62f-5397-83f5-69249e0a3c8e"
-FITSIO = "525bcba6-941b-5504-bd06-fd0dc1a4d2eb"
-Glob = "c27321d9-0574-5035-807b-f59d2c89b15c"
-JuliaAstroDocs = "5ba9df79-bc07-467f-bade-66a1d49082bd"
-Measurements = "eff96d63-e80a-5855-80a2-b1b0885c5ab7"
 MultiDocumenter = "87ed4bf0-c935-4a67-83c3-2a03bee4197c"
-Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
-Revise = "295af30f-e4ad-537b-8983-00126c2a3abe"
-Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
-UnitfulAstro = "6112ee07-acf9-5e0f-b108-d242c714bf9f"
 
 [sources]
 MultiDocumenter = {url = "https://github.com/JuliaComputing/MultiDocumenter.jl"}