npm doesn't support the "@" character in package names (it's used for
scopes). We eventually want to move from yarn to npm, so in preparation, rename
our internal packages accordingly so that they also work with npm workspaces.
Methodology: No manual code changes, just automatic search replace of
```
"@/accounts => "ente-accounts
"@/utils => "ente-utils
...
"@ente/shared => "ente-shared
```
Then reran prettier.
