fix(docs): remove fontawesome extension

It's unmaintained and mkdocs-material includes similar functionality now

.holo/branches/docs-site.lenses/mkdocs.toml

@@ -3,7 +3,6 @@ package = "holo/lens-mkdocs"
 requirements = [
     "mkdocs-material",
     "mkdocs-awesome-pages-plugin",
-    "fontawesome_markdown",
     "mdx_truly_sane_lists"
 ]
 

mkdocs.yml

@@ -20,9 +20,6 @@ plugins:
 extra_javascript:
   - https://unpkg.com/[email protected]/dist/mermaid.min.js
 
-extra_css:
-  - https://use.fontawesome.com/releases/v5.13.0/css/all.css
-
 markdown_extensions:
   - admonition
   - codehilite:
@@ -35,12 +32,11 @@ markdown_extensions:
       custom_fences:
         - name: mermaid
           class: mermaid
-          format: !!python/name:pymdownx.superfences.fence_div_format
+          format: "!!python/name:pymdownx.superfences.fence_div_format"
   - pymdownx.smartsymbols
   - meta
   - toc:
       # insert a blank space before the character
       permalink: " ¶"
   - smarty
-  - fontawesome_markdown
   - mdx_truly_sane_lists