Removed sync from template from INSTALL.md (#2781)

Signed-off-by: George Araújo <george.gcac@gmail.com>

Author: george-gca

CUSTOMIZE.md

@@ -92,7 +92,7 @@ scholar:
   first_name: [Albert, A.]
 ```
 
-If the entry matches one form of the last names and the first names, it will be underlined. Keep meta-information about your co-authors in [\_data/coauthors.yml](_data/coauthors.yml) and Jekyll will insert links to their webpages automatically. The co-author data format is as follows,
+If the entry matches one form of the last names and the first names, it will be underlined. Keep meta-information about your co-authors in [\_data/coauthors.yml](_data/coauthors.yml) and Jekyll will insert links to their webpages automatically. The co-author data format is as follows, with the last names lower cased and without accents as the key:
 
 ```yaml
 "adams":
@@ -115,7 +115,7 @@ If the entry matches one form of the last names and the first names, it will be
     url: https://en.wikipedia.org/wiki/Carl_Philipp_Emanuel_Bach
 ```
 
-If the entry matches one of the combinations of the last names and the first names, it will be highlighted and linked to the url provided.
+If the entry matches one of the combinations of the last names and the first names, it will be highlighted and linked to the url provided. Note that the keys **MUST BE** lower cased and **MUST NOT** contain accents. This is because the keys are used to match the last names in the BibTeX entries, considering possible variations.
 
 ### Buttons (through custom bibtex keywords)
 

INSTALL.md

@@ -184,38 +184,7 @@ In its default configuration, al-folio will copy the top-level `README.md` to th
 
 ## Upgrading from a previous version
 
-If you installed **al-folio** as described above, you can configure a [GitHub action](https://github.com/AndreasAugustin/actions-template-sync) to automatically sync your repository with the latest version of the theme.
-
-Go to Settings -> Actions -> General -> Workflow permissions, give Read and write permissions to GitHub Actions, check "Allow GitHub Actions to create and approve pull requests", and save your changes.
-
-Then go to Actions -> New workflow -> set up a workflow yourself, setup the following workflow and commit your changes:
-
-```yaml
-name: Sync from template
-on:
-  # cronjob trigger
-  schedule:
-    - cron: "0 0 1 * *"
-  # manual trigger
-  workflow_dispatch:
-jobs:
-  repo-sync:
-    runs-on: ubuntu-latest
-    steps:
-      # To use this repository's private action, you must check out the repository
-      - name: Checkout
-        uses: actions/checkout@v4
-      - name: actions-template-sync
-        uses: AndreasAugustin/actions-template-sync@v1
-        with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          source_repo_path: alshedivat/al-folio
-          upstream_branch: master
-```
-
-You will receive a pull request within your repository if there are some changes available in the template.
-
-Another option is to manually update your code by following the steps below:
+If you installed **al-folio** as described above, you can manually update your code by following the steps below:
 
 ```bash
 # Assuming the current directory is <your-repo-name>