chore(docs): Add README for //hive/hosts

nix/hive/hosts/Readme.md

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+# //hive/hosts
+
+Host configurations.
+
+Host definitions contain information required to build configurations for:
+
+- host system configs: `nixosConfigurations`, `darwinConfigurations`, `wslConfigurations`, `termuxConfigurations`, or `systemManagerConfigurations`
+- `home-manager` environment of main user.
+- `colmenaHive` config from collections of hosts.
+
+## Interface
+
+## Under-the-Hood
+
+`mkHosts`
+
+`pops.hive.setHosts`
+
+## Hosts
+
+### fw
+
+## To-Do
+
+- [ ] Figure out interface schema of `mkHost`
+- [ ] Create attrsets / dirs for each machine.
+- [ ] Configure POPs to export proper config type.
+- [ ] Configure `cellBlocks` to use `nixosConfigurations`, etc.
+- [ ] Configure `colmena`
+- [ ] Create a `blockTypes.pkgs` that imports overlays from each flake input.
+- [ ] Create a `lib` to collect relevant flake outputs from each flake input.
+  - [ ] homeModules / homeManagerModules / hmModules
+  - [ ] k8sManifests
+  - [ ] lib
+  - [ ] nixosModules / nixosModule
+  - [ ] overlays / overlay
+  - [ ] packages
+
+Upstream `omnibus` changes:
+
+- [ ] Export `diskoConfigurations.<hostname>` using `nixosConfigurations.<hostname>.config.disko` options
+- [ ] Enable support for alternate system types:
+
+  - [ ] `nixOnDroidConfigurations`
+  - [ ] `systemManagerConfigurations`
+  - [ ] `wslConfigurations`