Delete portal.en.md

01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/02.geometrical-optics-foundings/04.fermat-principle/07.fermat-principle-level-up/portal.en.md

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-title: 'course : level+1'
-hero_classes: ''
-hero_image: ''
----
-
-course : level+1
-
-or level+2 if current level=1
-
-or level-1 if current level=4
-
-#####for parallel or other level course :
-It will be possible to redirect towards an other page in the m3p2 cursus.
-Or to write here some paragraphes separated by html from an other pages, I think.
-Or write here a completely new parallel course
-
-For the moment, please wait.
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