feat: added IEEE and ACM social (alshedivat#2321)

I added further social integration for:

1. ACM: https://dl.acm.org/profile/
2. IEEE: https://ieeexplore.ieee.org/author/

Given their importance in computer science, I would like to have them in
al-folio.

_config.yml

@@ -67,6 +67,7 @@ og_image: # The site-wide (default for all links) Open Graph preview image
 # Social integration
 # -----------------------------------------------------------------------------
 
+acm_id: # your dl.acm.org/profile/id
 blogger_url: # your blogger URL
 bluesky_url: # your bluesky URL
 dblp_url: # your DBLP profile url
@@ -75,6 +76,7 @@ facebook_id: # your facebook id
 flickr_id: # your flickr id
 github_username: # your GitHub user name
 gitlab_username: # your GitLab user name
+ieee_id: # your ieeexplore.ieee.org/author/id
 instagram_id: # your instagram id
 kaggle_id: # your kaggle id
 keybase_username: # your keybase user name

_includes/social.liquid

@@ -28,6 +28,12 @@
 {% if site.research_gate_profile %}
   <a href="https://www.researchgate.net/profile/{{site.research_gate_profile}}/" title="ResearchGate"><i class="ai ai-researchgate"></i></a>
 {% endif %}
+{% if site.ieee_id %}
+  <a href="https://ieeexplore.ieee.org/author/{{site.ieee_id}}/" title="IEEE Xplore"><i class="ai ai-ieee"></i></a>
+{% endif %}
+{% if site.acm_id %}
+  <a href="https://dl.acm.org/profile/{{site.acm_id}}/" title="ACM DL"><i class="ai ai-acm"></i></a>
+{% endif %}
 {% if site.scopus_id %}
   <a href="https://www.scopus.com/authid/detail.uri?authorId={{site.scopus_id}}" title="Scopus"><i class="ai ai-scopus"></i></a>
 {% endif %}