feat: add previous and next button in content.html (#763)
* fix: linkedlist_stack.py 中的peek方法需要判空raise Error
栈空的时候不能再 peek() 。另外由于 pop() 复用了 peek() ，栈空时返回的 None 会传递到 pop() 中的 num ，导致后续的继续执行
self.peek.next 报错等后续问题
* Update linkedlist_stack.py
* Update linkedlist_queue.py
* Update linkedlist_deque.py
* feat: Move the pagination nav above the comments
* feat: Move the pagination nav above the comments
* Delete docs/overrides/partials/footer.html
* Update content.html
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Co-authored-by: Yudong Jin <krahets@163.com>
Co-authored-by: long.ma <long.ma@sumscope.com>
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krahets
malone6