Improve numerical readability scores for the tutorial.

[samcunliffe]

Inspired by @paddyroddy 's Vale talk, improving accessibility in general, and the fun of conforming fuzzy things like language into cold, hard numbers, I've made a pass at improving some numerical readability scores for the tutorial document.

In practice, this is me going through and splitting up long sentences, reducing the use of large words, and trying to say things clearly and briefly.

Anyone can play around with this themselves using:

❯ vale tutorial.md

on this branch (with the Readibility package enabled).

On the current HEAD of main:

 1:1      warning  Try to keep the LIX score       Readability.LIX
                   (47.71) below 35.
 1:1      warning  Try to keep the Automated       Readability.AutomatedReadability
                   Readability Index (11.64)
                   below 8.
 1:1      warning  Try to keep the Coleman–Liau    Readability.ColemanLiau
                   Index grade (11.12) below 9.
 1:1      warning  Try to keep the Flesch–Kincaid  Readability.FleschKincaid
                   grade level (11.87) below 8.
 1:1      warning  Try to keep the Gunning-Fog     Readability.GunningFog
                   index (13.52) below 10.
 1:1      warning  Try to keep the SMOG grade      Readability.SMOG
                   (13.25) below 10.
 1:1      warning  Try to keep the Flesch reading  Readability.FleschReadingEase
                   ease score (46.86) above 70.

On the HEAD of this branch:

 1:1     warning  Try to keep the LIX score       Readability.LIX
                  (39.32) below 35.
 1:1     warning  Try to keep the Coleman–Liau    Readability.ColemanLiau
                  Index grade (9.86) below 9.
 1:1     warning  Try to keep the Flesch–Kincaid  Readability.FleschKincaid
                  grade level (8.73) below 8.
 1:1     warning  Try to keep the Gunning-Fog     Readability.GunningFog
                  index (10.73) below 10.
 1:1     warning  Try to keep the SMOG grade      Readability.SMOG
                  (11.24) below 10.
 1:1     warning  Try to keep the Flesch reading  Readability.FleschReadingEase
                  ease score (57.70) above 70.

All numbers are better, though most are still "warning" level (we only lost the ARI).

Now! I'm aware this is coming very close to the tutorial delivery (sorry!!). So we might want to wait on merging this until afterwards. I leave it up to you @Saransh-cpp. You're the workshop lead...

[Copilot]

Pull Request Overview

This PR updates the tutorial to improve readability by simplifying language and rephrasing steps, and it enables the Vale Readability checks.

• Simplified and restructured tutorial sentences for clarity and brevity
• Added Vale Readability style to .vale.ini
• Cleaned up formatting and links in the tutorial

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
tutorial.md	Reworded steps and tips, improved flow, and added concise phrasing
.vale.ini	Added Readability package to enforce readability metrics in Vale scans

Comments suppressed due to low confidence (1)

tutorial.md:286

• [nitpick] Clarify this instruction by specifying the actual prompt indicator, for example: 'you should see (.venv) or (your_env_name) on the left of your terminal prompt'.

So activate your environment and you should see braces `( )` with your project slug on the left of your terminal window.

[samcunliffe]

(tagging @matt-graham and @paddyroddy: feel free but under no obligation to join the review)

[Saransh-cpp]

Thanks, @samcunliffe!! I went through the whole thing (while practising for tomorrow) and it looks great. I'll merge this in right now for tomorrow.