Add appendix_2 route (link?) to the vuepress config for the full-day workshop

[MicheleCynowicz]

Context This PR: https://github.com/FrontEndFoxes/docs/pull/136 created an appendix_2.md file for the Full Day workshop. However the appendix page it is supposed to create does not show up in the compiled website at https://workshops.vuevixens.org/workshops/vue/ (it should be visibly linked in the sidebar).

Expected Behavior There is a link to the appendix_2 file in the sidebar at https://workshops.vuevixens.org/workshops/vue/ and the appendix_2 file is displaying properly when the link is clicked.

Acceptance criteria Update the vuepress config to make this Appendix 2 build with vuepress.

Screenshots

Additional information Vuepress docs: https://vuepress.vuejs.org/guide/ vuepress config: https://github.com/FrontEndFoxes/docs/blob/master/.vuepress/config.js

[artikgupta]

@MicheleCynowicz, I would like to take this issue.

[MicheleCynowicz]

this work is done 🎉