chore: purge assets legacy — 12 SVG/webp, bretzel logo, CardContact dead code

- Suppression 11 SVG non référencés (Beer, Bonhome, Bonnet, Canne, Cookie,
  Courone, Hand, PainDep, Tasse, bg-homepage, logo bretzel)
- Suppression share-cover.webp non référencé
- Favicon bretzel → tadpole.svg
- Footer : CardContact inliné, suppression composant + scss
- Suppression .gitkeep inutile (pages/ a des fichiers)

Frontend/src/scss/components/CardContact.scss

@@ -1,73 +0,0 @@
-
-.Btn {
-  border: none;
-  border-radius: 50%;
-  width: 45px;
-  height: 45px;
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  transition-duration: .4s;
-  cursor: pointer;
-  position: relative;
-  background-color: rgb(31, 31, 31);
-  overflow: hidden;
-}
-
-.svgIcon {
-  transition-duration: .3s;
-}
-
-.svgIcon path {
-  fill: var(--color-white)
-}
-
-.text {
-  position: absolute;
-  font-family: var(--font);
-  color: var(--color-white);
-  width: 120px;
-  font-weight: 600;
-  opacity: 0;
-  transition-duration: .4s;
-}
-
-.Btn:hover {
-  width: 110px;
-  transition-duration: .4s;
-  border-radius: 30px;
-}
-
-.Btn:hover .text {
-  opacity: 1;
-  transition-duration: .4s;
-}
-
-.Btn:hover .svgIcon {
-  opacity: 0;
-  transition-duration: .3s;
-}
-
-.cardContact {
-  display: flex;
-  min-width: 100px ;
-  align-items: center;
-  flex-direction: column;
-}
-
-.cardContactContainer {
-  display: flex;
-  flex-direction: row;
-  flex-wrap: wrap;
-  justify-content: center;
-  gap: 5rem;
-  margin-bottom: 1rem;
-}
-
-.cardContact  p {
-  font-family: var(--font);
-  color: var(--color-grey);
-}
-
-
-

Frontend/src/scss/components/footer.scss

@@ -82,6 +82,19 @@
     width: 10%;
   }
   
+  .footer-github {
+    font-family: var(--font);
+    font-size: 0.9rem;
+    font-weight: 500;
+    color: var(--color-grey);
+    text-decoration: none;
+    transition: all 0.15s ease-in-out;
+
+    &:hover {
+      transform: scale(0.95);
+    }
+  }
+
   .copyright {
     font-family: var(--font);
     font-size: 0.8rem;