Prepare publish (#39)

* refactor!: rename `.data` and `.log` files
   - `timr.data` -> `app.data`
   - `timr.log` -> `app.log`
* refactor!: rename app name `timr` -> `timr-tui`
* docs: update README (paths, names, installation)
* update Cargo.toml
* fix(release): warning: unused variable: `log_dir`

src/storage.rs

@@ -1,6 +1,5 @@
 use crate::{
     common::{Content, Style},
-    constants::APP_NAME,
     widgets::pomodoro::Mode as PomodoroMode,
 };
 use color_eyre::eyre::Result;
@@ -65,7 +64,7 @@ impl Storage {
     }
 
     fn get_storage_path(&self) -> PathBuf {
-        self.data_dir.join(format!("{}.data", APP_NAME))
+        self.data_dir.join("app.data")
     }
 
     pub fn save(&self, data: AppStorage) -> Result<()> {