update e2e tests

[yubathom]

Some updates to e2e tests:

• fix error of dependency start-server-and-test update (^1.10.8) chore(deps-dev): bump start-server-and-test from 1.10.6 to 1.10.8 #544
• add test to proxy feature
• update test to url queries feature (test to add/remove passwords at url with the toggler)
• use nuxt build/start to run tests instead of nuxt

Some tests were failing because the vm of the ci was loading the assets (and the page was not ready to run the first test). This is a screenshot from a test that runned at travis:

[ghost]

DeepCode's analysis on #85c5f1 found:

• ❌ 0 critical issues. ⚠️ 0 warnings and 2 minor issues. ✔️ 2 issues were fixed.

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[TravisBuddy]

Hey @yubathom,
Your changes look good to me!

View build log

TravisBuddy Request Identifier: 9da13dc0-457d-11ea-8ac1-cf2d15c11453

[liyasthomas]

@yubathom thank you for this PR.