Adding draft content for hard work post.
Changing all_posts link to all-posts.

Partly addresses #31.
Adding 'new blog' post.
Second pass over "new blog" post with feedback from @sharonahermes.
Third pass over "new blog" post with feedback from @sharonahermes.
Moving new blog post to tomorrow.
Merge pull request #44 from dhermes/new-blog-post

Writing "new blog" post.
Fixing grammar (possessive) mistake in new blog post.
Renaming PNG to SVG before making changes.
Uses SVG instead of PNG for LaTeX images.

Also

- Removes all use of KaTeX, though this will be restored.
- Removes KaTeX css/js and fonts.
- Removes unused PNG files in content/latex_images.
- Manually sets width of SVG in <img> tags to a scaled up size.
- Sets max-width to 100% to eliminate overflow.
- Updates scripts to create and reference SVG files.

Fixes #38.