CI build matrix and gitlab pages

Squashed commit of the following:

commit 0a23b73172c1dfb07bab0daa0525e0993c22e47d
Author: Lucas Frérot <lucas.frerot@sorbonne-universite.fr>
Date: Thu Oct 26 16:35:36 2023 +0200

only build documentation on master branch

commit 04c23013552d69f1958c5eee5de91e081950fa66
Author: Lucas Frérot <lucas.frerot@sorbonne-universite.fr>
Date: Thu Oct 26 15:58:51 2023 +0200

allow import of tamaas

commit cee303c36400151206edde522a13d311677949c3
Author: Lucas Frérot <lucas.frerot@sorbonne-universite.fr>
Date: Thu Oct 26 15:52:36 2023 +0200

html as root of pages

commit 903a42f41c46686e15160a9b9047bcf8d53cfd44
Author: Lucas Frérot <lucas.frerot@sorbonne-universite.fr>
Date: Thu Oct 26 14:57:33 2023 +0200

within repository

commit 41701c4b5e0e4eb4c4cb5caa4a4f111666e9a646
Author: Lucas Frérot <lucas.frerot@sorbonne-universite.fr>
Date: Thu Oct 26 14:36:29 2023 +0200

added public folder as artifact

commit ef17b380b1ce032e0538af1f5032d77c5c12b565
Author: Lucas Frérot <lucas.frerot@sorbonne-universite.fr>
Date: Thu Oct 26 14:29:44 2023 +0200

renamed build step

commit 9c8231b4f143f0920246ae9fb85fe6c3d3d88881
Author: Lucas Frérot <lucas.frerot@sorbonne-universite.fr>
Date: Thu Oct 26 14:18:11 2023 +0200

renaming doc push job

commit 4c74be160ed09100e98a07845f2fdd55075a1b42
Author: Lucas Frérot <lucas.frerot@sorbonne-universite.fr>
Date: Thu Oct 26 13:52:13 2023 +0200

fixing pipeline

commit 0f119a0aa07af2732f2837f47d48f5075379d0b5
Author: Lucas Frérot <lucas.frerot@sorbonne-universite.fr>
Date: Thu Oct 26 12:33:37 2023 +0200

pushing doc to gitlab pages

commit e16815234513ca89476e9db9a53734f050055e07
Author: Lucas Frérot <lucas.frerot@sorbonne-universite.fr>
Date: Thu Oct 26 10:53:17 2023 +0200

added build matrix

commit 45fe7b6db00ec3f1be7571db50890fe17ea49091
Author: Lucas Frérot <lucas.frerot@sorbonne-universite.fr>
Date: Thu Oct 26 10:52:58 2023 +0200

added documentation ci build

commit 8faefe04a32519096dee3b9da4e136a128d1e864
Author: Lucas Frérot <lucas.frerot@sorbonne-universite.fr>
Date: Thu Oct 26 10:20:06 2023 +0200

no openmp in CI