Replace GitLab integration with Gitea in issue reporting

Migrated issue reporting functionality from GitLab to Gitea. Updated environment variables, dependencies, and configuration references to support Gitea. Introduced `GiteaClient` for communication with the Gitea API and refactored related code and tests to align with the new integration.

docs/commands.md

@@ -1,4 +1,4 @@
-# Commands
+# Commands
 
 **Packages:** `me.bobert.netneutrality.framework.command` (framework),
 `me.bobert.netneutrality.feature.*.command` (concrete commands)
@@ -139,7 +139,7 @@ Concrete commands live under `me.bobert.netneutrality.feature.*.command`, groupe
 | `PingCommand` | `basic` | Slash | Reply with the gateway ping. |
 | `ConfigureCommand` | `bot` | Slash | Configure the bot for the server (subcommands). |
 | `CryptoPriceCommand` | `crypto` | Slash | Fetch cryptocurrency prices. |
-| `ReportIssueCommand` | `git` | Slash | Report a bug (opens the GitLab report flow). |
+| `ReportIssueCommand` | `git` | Slash | Report a bug (opens the Gitea report flow). |
 | `PlayCommand` | `music` | Slash | Search/queue and start playback. |
 | `QueueCommand` / `ViewQueueCommand` | `music` | Slash | View/manage the queue. |
 | `SkipCommand` / `VoteSkipCommand` | `music` | Slash | Skip (or vote-skip) the current track. |