DOC-922: Add "Get started" button to L2 course

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Overall readability score: 41.07 (🟢 +0)

File	Readability
index.md	75.75 (🟢 +0)

View detailed metrics

🟢 - Shows an _increase_ in readability 🔴 - Shows a _decrease_ in readability File | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- [index.md](https://github.com/n8n-io/n8n-docs/blob/045ca6f32c2f23c2bd1dd242a1059f20a1d15bb9/docs/courses/level-two/index.md "docs/courses/level-two/index.md") | 75.75 | 68.57 | 7.49 | 8.7 | 10.13 | 7   | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0 Averages:   | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- Average | 41.07 | 33.64 | 12.03 | 15.36 | 14.45 | 8.67   | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0

View metric targets

Metric | Range | Ideal score --- | --- | --- Flesch Reading Ease | 100 (very easy read) to 0 (extremely difficult read) | 60 Gunning Fog | 6 (very easy read) to 17 (extremely difficult read) | 8 or less Auto. Read. Index | 6 (very easy read) to 14 (extremely difficult read) | 8 or less Coleman Liau Index | 6 (very easy read) to 17 (extremely difficult read) | 8 or less Dale-Chall Readability | 4.9 (very easy read) to 9.9 (extremely difficult read) | 6.9 or less