Use "hookable" instead of "hable" to support nuxt@2.17.3

[thomasv]

In nuxt@2.17.3 "hable" was replaced by "hookable", see nuxt/nuxt#24426

lib/plugins/context.js uses hable directly - this leads to problems when using nuxt-typo3 with nuxt@2.17.3. I think this must be considered in a full upgrade of nuxt-edge or can you add hookable/hable as direct dependency?