Migrate icons to SVG

[anselmbradford]

Additions

• Add issue and pull request templates.

Removals

• Remove cfpb_icon_font CSS references.

Changes

• Convert round numbered list image icons to pure CSS.
• Convert round check, plus, and minus icons to SVG icons.
• Convert share icons to SVG.
• Add padding to paragraph that was missing it on the landing page (see screenshot).

Testing

• With this repo and branch cloned into a sibling directory to cfgov-refresh, run pip install -e ../django-college-costs-comparison
• Visit /paying-for-college/ URLs and compare to production. There are still some image icons, but some should be converted to SVG or pure CSS.

Screenshots

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Notes

• I didn't convert image icons that are not in the SVG icon set and these icons are now positioned differently from production, however, they are left-aligned with no padding on production, so this is perhaps slightly better.