Remove remaining antd references

[corywatilo]

Looks like I just need to create some additional icons

ContactForm

import { CheckCircleFilled, ExclamationCircleOutlined, LoadingOutlined } from '@ant-design/icons'

CodeBlock

import { CopyOutlined } from '@ant-design/icons'

GithubIcon

import { GithubOutlined } from '@ant-design/icons'

PosthogAnnouncement

import { CloseOutlined } from '@ant-design/icons'

---

Layout.scss:30

a {
    color: black;
    font-weight: semibold;
    transition: none !important; /* unfortunately necessary until antd is removed */
}

global.css

.article-content a:not(.cta),
footer a:not(.cta) {
   ...
    transition: background-size 400ms !important; /* unfortunately necessary until antd is removed */