Removed codefund docs and plugin [Fix#1258]

[aemmadi]

Summary
Fixes #1258
Removed the existence of codefund in docsify, (i.e. codefund documentation and the plugin used by docsify)

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Other, please describe: Removed codefund plugin

If changing the UI of default theme, please provide the before/after screenshot:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)

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• Firefox
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• IE

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature
• Related documents have been updated
• Related tests have been updated

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Other information:

---

• DO NOT include files inside lib directory.

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[anikethsaha]

can you update your branch.

[trusktr]

This is fixed upstream: njleonzhang/docsify-plugin-codefund#6

Probably should add it back to the plugin list now.

Also maybe it is worth simply mentioning browser support for any plugin, if we happen to know, f.e. ("does not work in IE 11").

Wee can say at the top of the page something like "Note, any plugins created by third party authors are not guaranteed to have the same browser support as Docsify", and not remove them.