Add target timings in speaker notes

Dependencies

• [2] 5FJPILYN Finish first section
• [3] IEJDYQSW Initial commit
• [4] SAYGZU3I Add the Pijul section of the Successors talk
• [5] P3PI25SN Add a few sections

Change contents

• file addition: hanno-teaching.jpg (----------)
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• replacement in sections/2-introducing-pijul.md at line 8
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  − **Time Elapsed:** 27 min.
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  + **Time Elapsed:** 2 min.
• edit in sections/3-demo.md at line 5
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  + note:

  + **Time Elapsed:** 6 min.

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• edit in sections/4-comparison.md at line 4
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  + * Tabel die features met Git vergelijken
• replacement in sections/4-comparison.md at line 7
  [2.4170]→[2.4170:4210](∅→∅)
  − * Tabel die features met Git vergelijken
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  + note:

  + **Time Elapsed:** 14 min.

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• replacement in sections/a-wrap-up.md at line 13
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• edit in sections/a-wrap-up.md at line 16
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  + note:
• edit in sections/a-wrap-up.md at line 19
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  + **Time Elapsed:** 15 min.

  +