Issue #70: ADD accessibility bar and high contrast

package-lock.json

package.json

pnpm-lock.yaml

public/mecred_white.svg

src/app/components/AcessibilityBar.js

src/app/components/Content.js

src/app/components/Header.js

src/app/components/InfiniteScroll.js

src/app/components/InfiniteScrollCards.js

src/app/components/Loading.js

src/app/components/Overlay.js

src/app/components/SearchComponent.js

src/app/components/SideBar.js

src/app/entrar/components/Highlights.js

src/app/entrar/components/LoginForm.js

src/app/entrar/components/SignupModal.js

src/app/globals.css

src/app/perfil/[id]/components/AboutCard.js

src/app/perfil/[id]/components/FollowersCards.js

src/app/perfil/[id]/components/FollowingCards.js