Replace profile messages with naming messages

Rather than profile and gives-nick message types, we're going to use one msg type - `name` - and one rel type - `names`. This makes the messages look like either:

```
{
  "type": "name",
  "name": "pfraze"
}
```
to name self, or:
```
{
  "type": "name",
  "rel": "names",
  "feed": "tI2vEQOmOWJPdqJTsd/I2Co5bgGpjG5ukiDcXOzP22E=.blake2s",
  "name": "johnny"
}
```
to name someone else.

This PR also puts scare-quotes in the GUI around names that werent chosen by the local user.