refactor: Rename all remaining conduwuit references to Continuwuity

Also adds an alias for the old binary name to the dockerfile

Supersedes !1485
Closes #1536
Closes #2277

docs/deploying/nixos.mdx

@@ -57,7 +57,7 @@ The NixOS module provides these configuration options:
     - `max-perf`: Takes longer to build, but has more runtime optimizations
     - `max-perf-haswell`: Optimized for modern CPUs, don't use if your CPU is not Haswell or later.
 
-- `admin.enable`: Whether to add the `conduwuit` binary to `PATH` for administration (enabled by default)
+- `admin.enable`: Whether to add the `continuwuity` binary to `PATH` for administration (enabled by default)
 - `settings`: The Continuwuity configuration
 
 Use the `settings` option to configure Continuwuity itself. See the [example configuration file](../reference/config.mdx) for all available options.