Create landing page for training materials

.github/ISSUE_TEMPLATE/submit-learn.yaml

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+name: Submit learning material
+description: A form for the community to submit learning materials for inclusion on the `Learn` page. 
+title: "[Learn]: "
+labels: ["good first issue"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to submit your learning material for Epiverse!
+  - type: input
+    id: title
+    attributes:
+      label: Title
+      description: What is the title of the learning material? Preferably < 150 characters
+      placeholder: Using Epiverse for the first time
+    validations:
+      required: true
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe your material
+      description: What can help people understand whether this is relevant learning material for them?
+      placeholder: Here we walk you through all the steps to use Epiverse for the first time.
+    validations:
+      required: false
+  - type: input
+    id: img
+    attributes:
+      label: Cover image
+      description: Provide us with a link to an image that we can use for this. A screenshot for example.
+      placeholder: https://example.com/img.png
+    validations:
+      required: true
+  - type: textarea
+    id: authors
+    attributes:
+      label: Who are the authors?
+      description: Share who created the learning materials. Please separate authors with a comma.
+      placeholder: Author 1, Author 2
+    validations:
+      required: true
+  - type: textarea
+    id: categories
+    attributes:
+      label: What keywords do you want associated with this?
+      description: This will help people find your materials. Please separate with a comma.
+      placeholder: Keyword 1, Keyword2
+    validations:
+      required: false
+  - type: input
+    id: lang
+    attributes:
+      label: What language are these materials in?
+      placeholder: English
+    validations:
+      required: true
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Agreement
+      description: By submitting this issue you grant us the right to post the materials if they are relevant for Epiverse. You understand we do not guarantee posting.
+      options:
+        - label: I agree and understand that you may post the content I submit here.
+          required: true

_extensions/quarto-ext/fontawesome/_extension.yml

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+title: Font Awesome support
+author: Carlos Scheidegger
+version: 1.1.0
+quarto-required: ">=1.2.269"
+contributes:
+  shortcodes:
+    - fontawesome.lua