docs: update README and configuration documentation for clarity

- Revised the README to improve clarity in instructions for accessing the calendar miniapp, including changes to the phrasing for consistency.
- Updated the configuration documentation to enhance the description of the `EXTERNAL_CALENDAR_ICS_URL` setting, ensuring users understand its purpose and usage.
- Improved the import format documentation by translating terms to English for better accessibility to a wider audience.
- Enhanced the runbook with clearer instructions regarding access issues when using direct links, emphasizing the importance of using the bot's menu button.

docs/import-format.md

@@ -21,9 +21,9 @@ The **duty-schedule** format is used by the `/import_duty_schedule` command. Onl
 
 | Value | Meaning        | Notes                    |
 |-------|----------------|--------------------------|
-| **в**, **В**, **б**, **Б** | Duty (дежурство)   | Any of these four        |
-| **Н** | Unavailable (недоступен) | Exactly `Н`             |
-| **О** | Vacation (отпуск)       | Exactly `О`             |
+| **в**, **В**, **б**, **Б** | Duty        | Any of these four        |
+| **Н** | Unavailable | Exactly `Н`             |
+| **О** | Vacation    | Exactly `О`             |
 | (empty/space/other) | No event | Ignored for import       |
 
 The number of days in the schedule is the maximum length of any `duty` string when split by `;`. If `duty` is empty or missing, it is treated as an empty list of cells.
@@ -38,7 +38,7 @@ The number of days in the schedule is the maximum length of any `duty` string wh
   },
   "schedule": [
     {
-      "name": "Иванов Иван",
+      "name": "Ivanov Ivan",
       "duty": ";;В;;;Н;;О;;В;;"
     },
     {