Create an intermediary page for Run v1 links to encourage migration to v2

[jbonisteel]

There will be a period of time where we have shipped OONI Run v2 but we will still need to support V1 links. We want to encourage people to migrate to v2.

For launch, when someone accesses a v1 link we will:

• Launch an intermediary page with copy encouraging people to go to the new dashboard and create their link as a V2 link
• We will include some timing for dropping v1 support
• Deep-linking to run the v1 link can be initiated from the intermediary page

We will need to determine exact copy prior to shipping run v2

[jbonisteel]

How to test/review: https://run.test.ooni.org/nettest?tn=web_connectivity&ta=%7B%22urls%22%3A%5B%22https%3A%2F%2Ftwitter.com%2F%22%5D%7D&mv=1.2.0%27

[jbonisteel]

@agrabeli just flagging that this is a page we that will need a copy review