CI: use opam coq extradev package

.github/workflows/generate_docs.yml

@@ -23,30 +23,25 @@ jobs:
           branch_name=${{ github.head_ref }}
           echo "destination_dir=mathcomp-analysis_$branch_name" >> $GITHUB_ENV
 
-      - name: Clone Coq2html
-        uses: actions/checkout@v4
-        with:
-          repository: affeldt-aist/coq2html
-          path: coq2html
-
       - name: Set-up OCaml
         uses: ocaml/setup-ocaml@v3
         with:
           ocaml-compiler: 4.14
           opam-repositories: |
+            coq-extra-dev: https://coq.inria.fr/opam/extra-dev
             coq-released: https://coq.inria.fr/opam/released
             default: https://github.com/ocaml/opam-repository.git
 
       - name: Build Mathcomp Analysis
         run: opam install -y --deps-only . && opam exec -- make -j 4
 
       - name: Build coq2html
-        run: cd coq2html/ && opam exec -- make
+        run: opam install -y coq-rocqnavi && opam show coq-rocqnavi
 
       - name: Generate Documents
         run: |
           mkdir -p artifact/${{ env.destination_dir }}
-          coq2html/coq2html -title "Mathcomp Analysis" -d artifact/${{ env.destination_dir }} -base mathcomp -Q theories analysis -coqlib https://coq.inria.fr/doc/V8.18.0/stdlib/ -external https://math-comp.github.io/htmldoc_2_1_0/ mathcomp.ssreflect -external https://math-comp.github.io/htmldoc_2_1_0/ mathcomp.algebra classical/*.glob classical/*.v theories/*.glob theories/*.v
+          opam exec -- coq2html -title "Mathcomp Analysis" -d artifact/${{ env.destination_dir }} -base mathcomp -Q theories analysis -coqlib https://coq.inria.fr/doc/V8.18.0/stdlib/ -external https://math-comp.github.io/htmldoc_2_1_0/ mathcomp.ssreflect -external https://math-comp.github.io/htmldoc_2_1_0/ mathcomp.algebra classical/*.glob classical/*.v theories/*.glob theories/*.v
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4