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Update _posts/2020-09-27-Collectif-Ingénierie-Soutenable.md, assets/images/posts/conclusion_seminaire.png, assets/images/posts/positionnement_utc.png, assets/images/posts/RUTC.jpg files

Update _posts/2020-Collectif-Ingénierie-Soutenable.md, assets/images/posts/Historique_transformation_UTC.png, assets/images/posts/Historique-ID-en-UT-frise-1-1.png, assets/images/posts/schema_CID.png files

Update _posts/2020-08-27-rentree-climat-2020.md, _posts/2020-Collectif-Ingénierie-Soutenable.md files

Taylan Dogan authored Apr 19, 2020 and Andres Maldonado committed Apr 28, 2020

https://github.com/sergiokopplin/indigo/commit/2b5c07ebfc6b577e6a1aa083ae758034682d1356

Sérgio A. Kopplin authored Apr 16, 2020 and Andres Maldonado committed Apr 28, 2020

* https on most links (it's not needed for localhost)
* remove github workflow
* update Travis and Rake files (not used here, but could be used in the 
future)
* Indent correctly _config.yml

https://github.com/sergiokopplin/indigo/commit/6f7d4b3d3473db330a3ceeb8cacd3207aeb42e6b

'repository' was used by 'jekyll-github-metadata', which was removed

This fixes incorrect SEO tags

'github-pages' adds a lot of unneeded gems, among which 
'jekyll-github-metadata', which leads to incorrect URLs in SEO tags.

https://jekyllrb.com/docs/plugins/installation/

This is used by Jekyll SEO Tag to generate correct metadata