Cleanup & Improve examples

[acao]

• shared webpack and babel config for examples (does this detract from the replicability of examples?) to cut down on boilerplate
• improve monaco example to explain the github login
• add examples for createFetcher
• should we just move all examples to codesandbox???!? or is this better? hmmm!!
• remove yarn build from yarn build-bundles prebuild step, speeding up buildtimes

[changeset-bot]

⚠️ No Changeset found

Latest commit: 8911517

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[codecov]

Codecov Report

Merging #1975 (8911517) into main (2d91916) will increase coverage by 0.75%.
The diff coverage is 68.00%.

@@            Coverage Diff             @@
##             main    #1975      +/-   ##
==========================================
+ Coverage   65.70%   66.45%   +0.75%     
==========================================
  Files          85       86       +1     
  Lines        5106     5143      +37     
  Branches     1631     1640       +9     
==========================================
+ Hits         3355     3418      +63     
+ Misses       1747     1721      -26     
  Partials        4        4              

Impacted Files	Coverage Δ
...ackages/graphiql-toolkit/src/create-fetcher/lib.ts	50.90% <20.00%> (-8.67%)	⬇️
packages/graphiql/src/utility/HistoryStore.ts	62.26% <62.26%> (ø)
packages/graphiql/src/components/QueryHistory.tsx	73.91% <76.47%> (+6.69%)	⬆️
...iql/src/components/DocExplorer/MarkdownContent.tsx	100.00% <100.00%> (ø)
packages/graphiql/src/components/GraphiQL.tsx	58.34% <100.00%> (+0.83%)	⬆️
...hql-language-service-server/src/findGraphQLTags.ts	67.64% <100.00%> (+7.00%)	⬆️
...raphql-language-service-server/src/GraphQLCache.ts	52.25% <0.00%> (+0.60%)	⬆️
packages/graphiql/src/utility/QueryStore.ts	42.85% <0.00%> (+2.04%)	⬆️
... and 2 more

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