Add "SEO" section in our docs

[Martinsos]

Explain the state of SEO in Wasp, explain how they can set the meta tags for the landing page right now via head, and say also what we are planning for the future.

Related convo: https://discord.com/channels/686873244791210014/943092165964349500/1219983337985151026 .

[Martinsos]

A bit more about future plans: #911 .

[vincanger]

i added a "word on SSR & SEO" to OpenSaaS. Here it is for reference https://docs.opensaas.sh/guides/seo/#a-word-on-ssr--seo

[Martinsos]

Also mention usage of https://github.com/staylor/react-helmet-async as a solution.

[infomiho]

A bit of a circular reference, but still another user looking for this: https://ptb.discord.com/channels/686873244791210014/1294555644770127893/1294555644770127893

[Martinsos]

Related convo https://discord.com/channels/686873244791210014/1294555644770127893/1294555644770127893 .

[NeroxTGC]

Just improved a little bit the SEO page: wasp-lang/open-saas#297

[Martinsos]

Solution to ensure that all SPA pages are tracked (by @NeroxTGC ):

https://discord.com/channels/686873244791210014/1300366557309833236/1300388969934094388 .

Might be interesting to add to docs, or as a feature, or maybe as a guide, we have to yet see what it would fit, but I wanted to link to it here so we don't forget it.

[Martinsos]

Might also be interesting for us, @NeroxTGC recommended this guy's post: https://www.analyticsmania.com/post/single-page-web-app-with-google-tag-manager/

[Martinsos]

Some more useful stuff by @NeroxTGC here https://discord.com/channels/686873244791210014/1308427203641344031/1308441840319598593 .