Open TOC sidebar in Google Colab by default

[redeboer]

Open TOC sidebar in Google Colab by default. This can be enforce by setting the following in the notebook's main metadata:

 "metadata": {
  "colab": {
   "toc_visible": true
  },

Implementation

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1. FEAT: add hook for making Colab TOC visible repo-maintenance#174
   ✨ Feature +1
   
2. MAINT: update pip constraints and pre-commit ampform#358
   🔨 Maintenance +1
   
3. MAINT: update pip constraints and pre-commit ampform-dpd#79
   🔨 Maintenance +1
   
4. MAINT: autoupdate pre-commit hooks benchmarks#18
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5. MAINT: update pip constraints and pre-commit compwa-org#211
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6. MAINT: update pip constraints and pre-commit demo#18
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7. MAINT: autoupdate pre-commit hooks gluex-amplitude#22
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8. MAINT: autoupdate pre-commit hooks jax-mini-benchmark#4
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9. MAINT: update pip constraints and pre-commit polarimetry#314
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10. MAINT: update pip constraints and pre-commit PWA-pages#195
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11. MAINT: update pip constraints and pre-commit qrules#230
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12. MAINT: autoupdate pre-commit hooks strong2020-salamanca#19
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13. MAINT: update pip constraints and pre-commit tensorwaves#498
    🔨 Maintenance +1