Update time and temperature cookbook

[yincrash]

Description:

Use a temperature that comes with the default Home Assistant setup - weather Show how to use google fonts so a user doesn't have to setup font files to get something running.

Checklist:

• [ ] I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• [x] I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• [ ] Link added in /components/index.rst when creating new documents for new components or cookbook.

[yincrash]

I'm a new ESPHome user and definitely really love the cookbooks, but I wanted to get something up and running as fast as possible to see what I could do, and so I thought a few changes to this cookbook would make it simpler for a new user who may not have a temperature sensor set up, but could get something showing up immediately.

[coderabbitai[bot]]

## Walkthrough
The update modifies the sensor configuration and font definitions in the documentation. It changes the temperature sensor setup to import a single weather forecast (providing both temperature and unit details) instead of two separate sensors, and adds a new text sensor for the temperature unit. Additionally, generic font identifiers have been updated to descriptive names, and new Google font entries have been introduced with specified file paths and sizes. The display output text has also been updated accordingly.

## Changes

| File(s)                                                       | Change Summary                                                                                                                                                                                                                                                                                                              |
|---------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `cookbook/...display_time_temp_oled.rst` (sensors & display)  | Updated sensor configuration: Changed `inside_temperature` and `outside_temperature` sensors to use `entity_id: REPLACEME` with `internal: true`; added new internal text sensor `outside_temperature_unit` from weather forecast attribute. Modified display output text from "Mitt Smarta Hus" to "Time and Temperature" with updated formatting for inside and outside temperatures including unit. |
| `cookbook/...display_time_temp_oled.rst` (fonts)              | Renamed font identifiers from `font1`, `font2`, `font3` to `small`, `medium`, `large`. Added optional Google font entries (`gfonts://Silkscreen`, `gfonts://Roboto`) with specified sizes and file paths.                                                                                                                    |

## Sequence Diagram(s)

```mermaid
sequenceDiagram
    participant HA as Home Assistant
    participant Sensor as Sensor Module
    participant Display as OLED Display Logic

    HA->>Sensor: Provide weather.forecast_home data
    Sensor->>Display: Relay temperature and unit data
    Display->>Display: Format data using updated fonts ("medium" for inside, descriptive font for outside)
    Display->>User: Render "Time and Temperature" output

Suggested reviewers

• nagyrobi

<!-- walkthrough_end -->


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<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between 18bde38e63190a2988e0856d0e15ba71f3b64b0a and 1113071837645b0eab8becaeea35f24f8de16f6f.

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<summary>📒 Files selected for processing (1)</summary>

* `cookbook/display_time_temp_oled.rst` (6 hunks)

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* cookbook/display_time_temp_oled.rst

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