Add [sources] in docs/Project.toml and update docs CI

- Allows us to remove `]dev` calls and `push!()`-ing to `LOAD_PATH`
- Even though the compat for the base package is julia 1.6, the docs
  don't have to be: use current LTS for building docs CI
- Simplifies building docs locally because we can just ']instantiate'

Author: abhro

.github/workflows/BuildDocs.yml

@@ -9,13 +9,10 @@ jobs:
       - uses: actions/checkout@v5
       - uses: julia-actions/setup-julia@v2
         with:
-          version: '1.6'
+          version: 'lts'
       - name: Install dependencies
         shell: julia --project=docs/ --color=yes {0}
-        run: |
-          using Pkg
-          Pkg.develop(PackageSpec(path=pwd()))
-          Pkg.instantiate()
+        run: using Pkg; Pkg.instantiate()
       - name: Build Docs
         run: julia --project=docs/ --color=yes docs/make.jl
       - name: Deploy Documentation

docs/Project.toml

@@ -6,3 +6,6 @@ TermInterface = "8ea1fca8-c5ef-4a55-8b96-4e9afe9c9a3c"
 
 [compat]
 Documenter = "1"
+
+[sources]
+SymEngine = {path = ".."}

docs/make.jl

@@ -1,5 +1,3 @@
-push!(LOAD_PATH,"../src/")
-
 using Documenter, SymEngine
 
 makedocs(sitename="Symengine Julia API Docs")