Separate Keycloak JS from Keycloak

[jonkoops]

As part of improving the Keycloak JS adapter we want to split it off from the main Keycloak project so its lifecycle can be managed separately from the rest of the projects.

Tasks

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1. Move Keycloak JS into a seperate repository #5
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2. Create workflows to release Keycloak JS from own repo #2
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3. Move tests for Keycloak JS into own repo #4
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4. Move documentation for Keycloak JS into own repo #31
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5. Upload the documentation ZIP when doing the release #3
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6. Create GH workflow in quickstarts to update keycloak.js version keycloak-quickstarts#652
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7. Create GH workflow for keycloak-web to update keycloak.js version keycloak-web#553
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8. Pull release notes from keycloak-js repository keycloak-web#565
   kind/enhancement +1
   
9. Consume keycloak.js ZIP in keycloak-web keycloak-web#554
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10. Remove keycloak.js adapter documentation from main repo keycloak#36659
    area/docs kind/task team/core-clients +3