FIX: Footer in Gemini and Pisces always keep in bottom.

[AlynxZhou]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines.
• Tests for the changes have been added (for bug fixes / features).
• Docs have been added / updated (for bug fixes / features).

PR Type

What kind of change does this PR introduce?

• Bugfix.
• Feature.
• Code style update (formatting, local variables).
• Refactoring (no functional changes, no api changes).
• Build related changes.
• CI related changes.
• Documentation content changes.
• Other... Please describe:

What is the current behavior?

Issue Number(s): #1818

What is the new behavior?

Footer in Gemini and Pisces always keep in bottom.

• Screens with this changes: N/A
• Link to demo site with this changes: N/A

Does this PR introduce a breaking change?

• Yes.
• No.

[ivan-nginx]

Can u show here Github pages code? Your code in footer.swig and CSS if exists.

[AlynxZhou]

Hosted by <a href="https://pages.github.com" style="font-weight: bold">GitHub Pages</a>
<br>
Hosted by <a href="https://pages.coding.me" style="font-weight: bold">Coding Pages</a>

@ivan-nginx In China we have a github-like website called coding, some people like me use it as a mirror in China, but it ask user to add those lines "Hosted by Coding Pages" in pages, I added them in footer, and then I need to enlarge the footer height to contain them properly. However I think this has no influence to NexT, not all people need this.

[ivan-nginx]

@AlynxZhou there is new option custom_text in #1886.

[AlynxZhou]

@ivan-nginx That's really cool! Thanks!