Use images for social meta tags

[decabeza]

Background

Now when a user share a CONSUL's page by default shows a general image.

Share on Facebook

Share on Twitter

What

If the user has uploaded an image to their proposal or budget investment show this image when share on social networks instead of default image.

How

On proposals/show.html.erb:

• Adds twitter_image_url and og_image_url properties on render "shared/social_media_meta_tags" (only if proposal image is present)

On investments/_investment_show.html.erb:

• Adds shared/social_media_meta_tags partial (use proposal as reference)

• Adds twitter_image_url and og_image_url properties on render "shared/social_media_meta_tags" (only if investment image is present)

[aitbw]

I'll handle this.