Update generate-readmes script to typescript, update content wording, and regenerate all readmes (Turfjs#2528)

* Fix generate-docs to work with tsx (add extension, fix a few TS errors). monorepolint rule changed to reflect ts file extension. Add node to eslint env config so editors can find definitions of node variables (such as __dirname) used in scripts.

* Change project root docs target to use tsx and generate-docs.ts. Tighten up gnerates-docs.ts folder globbing - was inadvertently matching when my working parent directory was named something like ~/code/turf-docs-test/... interpreting docs-test as a package name. Reworded readme postfix content to be clearer on the different ways of installing. Updated a few links from http to https.

* Result of running yarn docs from the project root with the previously committed changes.

* Applying recently merged changes (from PR Turfjs#2523) to this new module.

Author: smallsaucepan

.eslintrc.js

@@ -25,7 +25,7 @@ module.exports = {
     ecmaVersion: 6,
     sourceType: "module",
   },
-  env: { es6: true },
+  env: { es6: true, node: true },
   rules,
 
   overrides: [

.monorepolint.config.ts

@@ -164,7 +164,7 @@ module.exports = {
       {
         options: {
           scripts: {
-            docs: "tsx ../../scripts/generate-readmes",
+            docs: "tsx ../../scripts/generate-readmes.ts",
             test: "npm-run-all --npm-path npm test:*",
           },
         },