chore: Remove DSN loader from develop docs

The DSN loader has never worked in develop docs as develop.sentry.dev is
not in the allowlist for CORS domains.

DSN substitution is infrequently used in develop docs and not having it
is simpler than fixing and maintaining it.

src/components/codeContext.tsx

@@ -1,4 +1,4 @@
-import React, {useState, useEffect} from 'react';
+import React, {useState} from 'react';
 
 type ProjectCodeKeywords = {
   DSN: string;
@@ -20,27 +20,6 @@ type CodeKeywords = {
   PROJECT: ProjectCodeKeywords[];
 };
 
-type Dsn = {
-  scheme: string;
-  publicKey: string;
-  secretKey?: string;
-  host: string;
-  pathname: string;
-};
-
-type ProjectApiResult = {
-  dsn: string;
-  dsnPublic: string;
-  id: string;
-  slug: string;
-  organizationId: string;
-  organizationSlug: string;
-  projectSlug: string;
-};
-
-// only fetch them once
-let cachedCodeKeywords = null;
-
 const DEFAULTS: CodeKeywords = {
   PROJECT: [
     {
@@ -69,104 +48,11 @@ type CodeContextType = {
 
 const CodeContext = React.createContext<CodeContextType | null>(null);
 
-const parseDsn = function (dsn: string): Dsn {
-  const match = dsn.match(/^(.*?\/\/)(.*?):(.*?)@(.*?)(\/.*?)$/);
-
-  return {
-    scheme: match[1],
-    publicKey: escape(match[2]),
-    secretKey: escape(match[3]),
-    host: escape(match[4]),
-    pathname: escape(match[5]),
-  };
-};
-
-const formatMinidumpURL = ({scheme, host, pathname, publicKey}: Dsn) => {
-  return `${scheme}${host}/api${pathname}/minidump/?sentry_key=${publicKey}`;
-};
-
-const formatUnrealEngineURL = ({scheme, host, pathname, publicKey}: Dsn) => {
-  return `${scheme}${host}/api${pathname}/unreal/${publicKey}/`;
-};
-
-const formatApiUrl = ({scheme, host}: Dsn) => {
-  const apiHost = host.indexOf('.ingest.') >= 0 ? host.split('.ingest.')[1] : host;
-
-  return `${scheme}${apiHost}/api`;
-};
-
-export function fetchCodeKeywords() {
-  return new Promise(resolve => {
-    function transformResults(projects: ProjectApiResult[]) {
-      if (projects.length === 0) {
-        console.warn('Unable to fetch codeContext - using defaults.');
-        resolve(DEFAULTS);
-      } else {
-        resolve({
-          PROJECT: projects.map(project => {
-            const parsedDsn = parseDsn(project.dsn);
-            return {
-              DSN: project.dsn,
-              PUBLIC_DSN: project.dsnPublic,
-              PUBLIC_KEY: parsedDsn.publicKey,
-              SECRET_KEY: parsedDsn.secretKey,
-              API_URL: formatApiUrl(parsedDsn),
-              PROJECT_ID: project.id,
-              PROJECT_SLUG: project.projectSlug,
-              ORG_ID: project.organizationId,
-              ORG_SLUG: project.organizationSlug,
-              ORG_INGEST_DOMAIN: `o${project.organizationId}.ingest.sentry.io`,
-              MINIDUMP_URL: formatMinidumpURL(parsedDsn),
-              UNREAL_URL: formatUnrealEngineURL(parsedDsn),
-              title: `${project.organizationSlug} / ${project.projectSlug}`,
-            };
-          }),
-        });
-      }
-    }
-
-    const xhr = new XMLHttpRequest();
-    xhr.open('GET', 'https://sentry.io/docs/api/user/');
-    xhr.withCredentials = true;
-    xhr.responseType = 'json';
-    xhr.onreadystatechange = () => {
-      if (xhr.readyState === 4) {
-        if (xhr.status === 0) {
-          transformResults([]);
-        } else {
-          const {
-            projects,
-          }: {
-            projects: ProjectApiResult[];
-          } = xhr.response;
-          transformResults(projects);
-        }
-      }
-    };
-    xhr.send(null);
-  });
-}
-
 export default CodeContext;
 
-export function useCodeContextState(fetcher = fetchCodeKeywords) {
-  let [codeKeywords, setCodeKeywords] = useState(DEFAULTS);
-  if (codeKeywords === null && cachedCodeKeywords !== null) {
-    setCodeKeywords(cachedCodeKeywords);
-    codeKeywords = cachedCodeKeywords;
-  }
-
-  useEffect(() => {
-    if (cachedCodeKeywords === null) {
-      fetcher().then((config: CodeKeywords) => {
-        cachedCodeKeywords = config;
-        setCodeKeywords(config);
-      });
-    }
-  });
-
+export function useCodeContextState() {
   return {
-    codeKeywords,
+    codeKeywords: DEFAULTS,
     sharedCodeSelection: useState(null),
     sharedKeywordSelection: useState({}),
   };