Implement landing page for submission portal

[eecavanna]

In this branch, I added some new sections to the submission portal landing page.

TitleBanner.vue

This component contains a page title and subtitle overlaying a banner image. The component was modeled after a header on the NMDC website.

Note: The banner image is a 470 KB PNG file (i.e. submission-portal-hero.png). I failed to find an SVG version and don't think one exists. Given that the image contains a color gradient, I'm wondering whether a JPG version would be significantly smaller while being insignificantly lower quality.

IconBar.vue

This component contains a row of three icon-title pairs, each pair linking to some documentation. The icons belong to the Material Design Icons library, which is used elsewhere in the code base.

IntroBlurb.vue

This component contains three paragraphs that introduce the submission portal. In this component's name, I used "blurb" to refer to the entire set of text.

This is only visible when the user is either (a) logged out; or (b) logged in, but does not have any submissions.

LoginPrompt.vue

This component contains a plainly-styled "alert" inviting the visitor to log into ORCiD; or create an ORCiD if they don't have one. This takes the place of the previous, loose login message.

Components in context

Here are links to screenshots showing the components in context.

• Visitors that are not logged in will see this.
• Visitors that are logged in and have no submissions will see this.
• Visitors that are logged in and have submissions will see this.

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There is one remaining task, but I don't want to hold up the review(s) for it. That remaining task is to finalize the link to the schema documentation. I will pursue that after requesting reviews as I don't expect it to have an impact on the reviews (it'll be a one-line change).

[pkalita-lbl]

Seems good to me. I'll let people with more Vue experience weigh in on the finer points.

[marySalvi]

Some minor changes but overall looks great!

[eecavanna]

I have addressed all the review feedback.

FYI: I am still waiting on guidance from a team member regarding where one of the links will point. I'll reach out to her again about it.

[eecavanna]

I'm ready for this to be merged in (assuming nobody objects to its contents).

[naglepuff]

Sorry to swoop in last minute like this but the "i" in ORCID should be capitalized. The "i" in ORCID iD is lowercase.

Dismissing review because, even though I made the requested changes, I think GitHub is preventing me from merging until the requester approves them. In this case, I think the changes are self-explanatory, and I want to merge this in and close the issue before the sprint ends.