feat: Support XDG config home

This change implements support for the XDG Base Directory Specification for the configuration file.

The configuration file is now read from `$XDG_CONFIG_HOME/hexai/config.json` if the `XDG_CONFIG_HOME` environment variable is set.
If it is not set, it falls back to the previous location, `$HOME/.config/hexai/config.json`.

This change also includes:
- A fix for a bug in the test suite where a test was failing due to an environment variable being set.
- Updates to the documentation to reflect the new configuration file location.
- A version bump to 0.1.0.

1 files changed, 0 insertions, 15 deletions

diff --git a/IDEAS.md b/IDEAS.md
index 70f6537..11cae34 100644
--- a/IDEAS.md
+++ b/IDEAS.md
@@ -50,18 +50,3 @@ Be able to switch LLMs.
 
 ## Usage notes
 
-Helix' `languages.toml`
-
-```toml
-[[language]]
-name = "go"
-auto-format= true
-diagnostic-severity = "hint"
-formatter = { command = "goimports" }
-language-servers = [ "gopls", "golangci-lint-lsp", "hexai" ]
-# language-servers = [ "gopls", "golangci-lint-lsp", "lsp-ai", "gpt", "hexai" ]
-
-[language-server.hexai]
-command = "hexai"
-```
-