Fix path in image.html

[remibetin]

Resolves w3c/wai-website#829

Expected behaviour

• When the resource is not developed in the main wai-website repo, the image src should be prepended with /content-images/{name of the repo}/
• Else, the image src should be prepended with /content-images/

Current behaviour

• When the resource is not developed in the main wai-website repo, the image src is prepended with /content-images/{name of the repo}/: OK ✅
• When the resource is developed in the main wai-website repo, the image src is prepended with /content-images//: Not OK ❌

Source of the problem

{%- assign repo = page.github.repository | replace: "w3c/", "" -%}
{%- if repo != "wai-website" -%}
{%- assign path = "/" | prepend: repo | prepend: "/content-images/" | relative_url -%}
{%- else -%}
{%- assign path = "/content-images/" | relative_url -%}
{%- endif -%}

• Since wai-website is the default repository, the github.repository variable is no longer used for resources developed in wai-website repo.
• {%- if repo != "wai-website" -%} was always truthy (see https://shopify.github.io/liquid/basics/truthy-and-falsy/)

Solution

{%- if page.github.repository -%}
{%- assign repo = page.github.repository | replace: "w3c/", "" -%}
{%- assign path = "/" | prepend: repo | prepend: "/content-images/" | relative_url -%}
{%- else -%}
{%- assign path = "/content-images/" | relative_url -%}
{%- endif -%}

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