Release v0.2.0

This marks a major release d2lbook v0.2.0, adding tonnes of new features to aid d2l development ecosystem while also fixing multiple bugs.

• Feat: Allow specification of bibtex bibfile (89db4fe)
• Feat: Support citet and citep (8f122b3)
• Fix: Bug ModuleNotFoundError No module named 'sphinx' (#55)
• Feat: Enable d2l default tab even if a few notebooks have missing default (#51)
• Fix: Bug missing CUDA resource error for paddle (#50)
• Maint: Unpin nbformat & nbconvert; remove jupyterclient dependency (#47)
• Feat: Add fonts installation script to d2lbook (#44)
• Feat: Add ability to pass a complete chapter for translation (#41)
• Fix: Bug #39 d2lbook translate failure due to merge conflicts if src repo already exists (#40)
• Feat: Log the package version when uploading to github (10d40e7)
• Feat: Add support for alias/reverse alias to d2l lib (3787d39)
• Feat: Merge two consecutive code blocks in a tab (a17b768)
• Feat: Add fluent alias support (8871dce)
• Dep: Deprecate save_filename, save_mark, save_patterns and version (0b7c863)
• Feat: Add support build/deploy slides (6b60d8d)
• Feat: Enable code format for every code cell (970297b)
• Feat: Use isort to format import (96ab562)
• Feat: Add scheduler to manage computing resources (#28)
• Feat: Add slides mark (ffc8886)
• Feat: Remove empty lines in import code blocks (caca84a)
• Fix: copy-button svg link error (cbc0e90)
• Fix: Update sphinx 2.0 deprecations (#32)
• Feat: Deploy pdfs for other tabs (f5e1ccf)
• Feat: Add lib support for customized header (3331844)
• Feat: Support #@hide, #@hide_output, #@hide_code to hide notebook code and output (89b8934)
• Feat: Add support @save_all and @hide_all (1950193)
• Feat: Add support for tabs (3ee4ce9)