Dynamic unlimited reward additions and animation option

[stevenjoezhang]

Changes in _config.yml:

-reward:
-  enable: false
-  animation: false
-  #comment: Donate comment here
-  #wechatpay: /images/wechatpay.jpg	
-  #alipay: /images/alipay.jpg	reward:
-  #bitcoin: /images/bitcoin.jpg
+reward_settings:
+  enable: false
+  animation: false
+  #comment: Donate comment here
+reward:
+  #wechatpay: /images/wechatpay.png
+  #alipay: /images/alipay.png
+  #bitcoin: /images/bitcoin.png

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines.
• Tests for the changes was maked (for bug fixes / features).
  • Muse | Mist have been tested.
  • Pisces | Gemini have been tested.
• Docs in NexT website have been added / updated (for new 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 resolved: #596, iissnan/hexo-theme-next#2199

What is the new behavior?

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

How to use?

+reward_settings:
+  enable: true
+  animation: false
+  comment: Donate comment here

In NexT _config.yml:

reward:
  wechatpay: /images/wechatpay.png
  alipay: /images/alipay.png
  bitcoin: /images/bitcoin.png
  paypal: /images/paypal.png
  monero: /images/monero.png
  ...

Does this PR introduce a breaking change?

• Yes.
• No.

[ivan-nginx]

#monero: /images/monero.png

[stevenjoezhang]

I'll add monero and paypal as examples to the docs