* feat: LOGO_DESTINATION env var added for use it on Header component
On index.js file of the Header component, currenly there is a hard-coded link of "https://www.edx.org". I added a new enviroment variable LOGO_DESTINATION to use it in this Header.
I have also added a mechanism to use the LMS_BASE_URL environment variable if the LOGO_DESTINATION environment variable is not found or is null.
* fix: Hard-coded link in Header component changed by a env var
`index.jsx` file of Header component updated with change the hard-coded link of https://www.edx.org with a component property.
`index.jsx` file of root project updated. Added the environment variable LMS BASE_URL to the parameters of the Header Component
* fix: lint errors in previous commits
* style: change structure of the solution
02c154ef50